diff --git a/android/build.gradle b/android/build.gradle
index dbdff724..5c57eede 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -2,7 +2,7 @@ group 'io.carius.lars.ar_flutter_plugin'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.5.20'
     repositories {
         google()
         jcenter()
diff --git a/example/lib/examples/cloudanchorexample.dart b/example/lib/examples/cloudanchorexample.dart
index f90032df..5734087e 100644
--- a/example/lib/examples/cloudanchorexample.dart
+++ b/example/lib/examples/cloudanchorexample.dart
@@ -1,5 +1,3 @@
-import 'dart:convert';
-
 import 'package:ar_flutter_plugin/managers/ar_location_manager.dart';
 import 'package:ar_flutter_plugin/managers/ar_session_manager.dart';
 import 'package:ar_flutter_plugin/managers/ar_object_manager.dart';
@@ -236,33 +234,31 @@ class _CloudAnchorWidgetState extends State<CloudAnchorWidget> {
       List<ARHitTestResult> hitTestResults) async {
     var singleHitTestResult = hitTestResults.firstWhere(
         (hitTestResult) => hitTestResult.type == ARHitTestResultType.plane);
-    if (singleHitTestResult != null) {
-      var newAnchor = ARPlaneAnchor(
-          transformation: singleHitTestResult.worldTransform, ttl: 2);
-      bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
-      if (didAddAnchor ?? false) {
-        this.anchors.add(newAnchor);
-        // Add note to anchor
-        var newNode = ARNode(
-            type: NodeType.webGLB,
-            uri: "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
-            scale: Vector3(0.2, 0.2, 0.2),
-            position: Vector3(0.0, 0.0, 0.0),
-            rotation: Vector4(1.0, 0.0, 0.0, 0.0),
-            data: {"onTapText": "Ouch, that hurt!"});
-        bool? didAddNodeToAnchor =
-            await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
-        if (didAddNodeToAnchor ?? false) {
-          this.nodes.add(newNode);
-          setState(() {
-            readyToUpload = true;
-          });
-        } else {
-          this.arSessionManager!.onError("Adding Node to Anchor failed");
-        }
+    var newAnchor = ARPlaneAnchor(
+        transformation: singleHitTestResult.worldTransform, ttl: 2);
+    bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
+    if (didAddAnchor ?? false) {
+      this.anchors.add(newAnchor);
+      // Add note to anchor
+      var newNode = ARNode(
+          type: NodeType.webGLB,
+          uri: "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
+          scale: Vector3(0.2, 0.2, 0.2),
+          position: Vector3(0.0, 0.0, 0.0),
+          rotation: Vector4(1.0, 0.0, 0.0, 0.0),
+          data: {"onTapText": "Ouch, that hurt!"});
+      bool? didAddNodeToAnchor =
+          await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
+      if (didAddNodeToAnchor ?? false) {
+        this.nodes.add(newNode);
+        setState(() {
+          readyToUpload = true;
+        });
       } else {
-        this.arSessionManager!.onError("Adding Anchor failed");
+        this.arSessionManager!.onError("Adding Node to Anchor failed");
       }
+    } else {
+      this.arSessionManager!.onError("Adding Anchor failed");
     }
   }
 
diff --git a/example/lib/examples/externalmodelmanagementexample.dart b/example/lib/examples/externalmodelmanagementexample.dart
index 85e8cbe0..5d121120 100644
--- a/example/lib/examples/externalmodelmanagementexample.dart
+++ b/example/lib/examples/externalmodelmanagementexample.dart
@@ -1,5 +1,3 @@
-import 'dart:convert';
-
 import 'package:ar_flutter_plugin/managers/ar_location_manager.dart';
 import 'package:ar_flutter_plugin/managers/ar_session_manager.dart';
 import 'package:ar_flutter_plugin/managers/ar_object_manager.dart';
@@ -266,33 +264,31 @@ class _ExternalModelManagementWidgetState
       List<ARHitTestResult> hitTestResults) async {
     var singleHitTestResult = hitTestResults.firstWhere(
         (hitTestResult) => hitTestResult.type == ARHitTestResultType.plane);
-    if (singleHitTestResult != null) {
-      var newAnchor = ARPlaneAnchor(
-          transformation: singleHitTestResult.worldTransform, ttl: 2);
-      bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
-      if (didAddAnchor!) {
-        this.anchors.add(newAnchor);
-        // Add note to anchor
-        var newNode = ARNode(
-            type: NodeType.webGLB,
-            uri: this.selectedModel.uri,
-            scale: VectorMath.Vector3(0.2, 0.2, 0.2),
-            position: VectorMath.Vector3(0.0, 0.0, 0.0),
-            rotation: VectorMath.Vector4(1.0, 0.0, 0.0, 0.0),
-            data: {"onTapText": "I am a " + this.selectedModel.name});
-        bool? didAddNodeToAnchor =
-            await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
-        if (didAddNodeToAnchor!) {
-          this.nodes.add(newNode);
-          setState(() {
-            readyToUpload = true;
-          });
-        } else {
-          this.arSessionManager!.onError("Adding Node to Anchor failed");
-        }
+    var newAnchor = ARPlaneAnchor(
+        transformation: singleHitTestResult.worldTransform, ttl: 2);
+    bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
+    if (didAddAnchor!) {
+      this.anchors.add(newAnchor);
+      // Add note to anchor
+      var newNode = ARNode(
+          type: NodeType.webGLB,
+          uri: this.selectedModel.uri,
+          scale: VectorMath.Vector3(0.2, 0.2, 0.2),
+          position: VectorMath.Vector3(0.0, 0.0, 0.0),
+          rotation: VectorMath.Vector4(1.0, 0.0, 0.0, 0.0),
+          data: {"onTapText": "I am a " + this.selectedModel.name});
+      bool? didAddNodeToAnchor =
+          await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
+      if (didAddNodeToAnchor!) {
+        this.nodes.add(newNode);
+        setState(() {
+          readyToUpload = true;
+        });
       } else {
-        this.arSessionManager!.onError("Adding Anchor failed");
+        this.arSessionManager!.onError("Adding Node to Anchor failed");
       }
+    } else {
+      this.arSessionManager!.onError("Adding Anchor failed");
     }
   }
 
diff --git a/example/lib/examples/objectgesturesexample.dart b/example/lib/examples/objectgesturesexample.dart
index 6d9f42ae..15b80b0c 100644
--- a/example/lib/examples/objectgesturesexample.dart
+++ b/example/lib/examples/objectgesturesexample.dart
@@ -10,9 +10,7 @@ import 'package:ar_flutter_plugin/datatypes/node_types.dart';
 import 'package:ar_flutter_plugin/datatypes/hittest_result_types.dart';
 import 'package:ar_flutter_plugin/models/ar_node.dart';
 import 'package:ar_flutter_plugin/models/ar_hittest_result.dart';
-import 'package:flutter/services.dart';
 import 'package:vector_math/vector_math_64.dart';
-import 'dart:math';
 
 class ObjectGesturesWidget extends StatefulWidget {
   ObjectGesturesWidget({Key? key}) : super(key: key);
@@ -101,30 +99,28 @@ class _ObjectGesturesWidgetState extends State<ObjectGesturesWidget> {
       List<ARHitTestResult> hitTestResults) async {
     var singleHitTestResult = hitTestResults.firstWhere(
         (hitTestResult) => hitTestResult.type == ARHitTestResultType.plane);
-    if (singleHitTestResult != null) {
-      var newAnchor =
-          ARPlaneAnchor(transformation: singleHitTestResult.worldTransform);
-      bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
-      if (didAddAnchor!) {
-        this.anchors.add(newAnchor);
-        // Add note to anchor
-        var newNode = ARNode(
-            type: NodeType.webGLB,
-            uri:
-                "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
-            scale: Vector3(0.2, 0.2, 0.2),
-            position: Vector3(0.0, 0.0, 0.0),
-            rotation: Vector4(1.0, 0.0, 0.0, 0.0));
-        bool? didAddNodeToAnchor =
-            await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
-        if (didAddNodeToAnchor!) {
-          this.nodes.add(newNode);
-        } else {
-          this.arSessionManager!.onError("Adding Node to Anchor failed");
-        }
+    var newAnchor =
+        ARPlaneAnchor(transformation: singleHitTestResult.worldTransform);
+    bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
+    if (didAddAnchor!) {
+      this.anchors.add(newAnchor);
+      // Add note to anchor
+      var newNode = ARNode(
+          type: NodeType.webGLB,
+          uri:
+              "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
+          scale: Vector3(0.2, 0.2, 0.2),
+          position: Vector3(0.0, 0.0, 0.0),
+          rotation: Vector4(1.0, 0.0, 0.0, 0.0));
+      bool? didAddNodeToAnchor =
+          await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
+      if (didAddNodeToAnchor!) {
+        this.nodes.add(newNode);
       } else {
-        this.arSessionManager!.onError("Adding Anchor failed");
+        this.arSessionManager!.onError("Adding Node to Anchor failed");
       }
+    } else {
+      this.arSessionManager!.onError("Adding Anchor failed");
     }
   }
 
diff --git a/example/lib/examples/objectsonplanesexample.dart b/example/lib/examples/objectsonplanesexample.dart
index e23e427d..7bdd27e0 100644
--- a/example/lib/examples/objectsonplanesexample.dart
+++ b/example/lib/examples/objectsonplanesexample.dart
@@ -10,9 +10,7 @@ import 'package:ar_flutter_plugin/datatypes/node_types.dart';
 import 'package:ar_flutter_plugin/datatypes/hittest_result_types.dart';
 import 'package:ar_flutter_plugin/models/ar_node.dart';
 import 'package:ar_flutter_plugin/models/ar_hittest_result.dart';
-import 'package:flutter/services.dart';
 import 'package:vector_math/vector_math_64.dart';
-import 'dart:math';
 
 class ObjectsOnPlanesWidget extends StatefulWidget {
   ObjectsOnPlanesWidget({Key? key}) : super(key: key);
@@ -99,41 +97,28 @@ class _ObjectsOnPlanesWidgetState extends State<ObjectsOnPlanesWidget> {
       List<ARHitTestResult> hitTestResults) async {
     var singleHitTestResult = hitTestResults.firstWhere(
         (hitTestResult) => hitTestResult.type == ARHitTestResultType.plane);
-    if (singleHitTestResult != null) {
-      var newAnchor =
-          ARPlaneAnchor(transformation: singleHitTestResult.worldTransform);
-      bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
-      if (didAddAnchor!) {
-        this.anchors.add(newAnchor);
-        // Add note to anchor
-        var newNode = ARNode(
-            type: NodeType.webGLB,
-            uri:
-                "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
-            scale: Vector3(0.2, 0.2, 0.2),
-            position: Vector3(0.0, 0.0, 0.0),
-            rotation: Vector4(1.0, 0.0, 0.0, 0.0));
-        bool? didAddNodeToAnchor =
-            await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
-        if (didAddNodeToAnchor!) {
-          this.nodes.add(newNode);
-        } else {
-          this.arSessionManager!.onError("Adding Node to Anchor failed");
-        }
-      } else {
-        this.arSessionManager!.onError("Adding Anchor failed");
-      }
-      /*
-      // To add a node to the tapped position without creating an anchor, use the following code (Please mind: the function onRemoveEverything has to be adapted accordingly!):
+    var newAnchor =
+        ARPlaneAnchor(transformation: singleHitTestResult.worldTransform);
+    bool? didAddAnchor = await this.arAnchorManager!.addAnchor(newAnchor);
+    if (didAddAnchor!) {
+      this.anchors.add(newAnchor);
+      // Add note to anchor
       var newNode = ARNode(
-          type: NodeType.localGLTF2,
-          uri: "Models/Chicken_01/Chicken_01.gltf",
+          type: NodeType.webGLB,
+          uri:
+              "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
           scale: Vector3(0.2, 0.2, 0.2),
-          transformation: singleHitTestResult.worldTransform);
-      bool didAddWebNode = await this.arObjectManager.addNode(newNode);
-      if (didAddWebNode) {
+          position: Vector3(0.0, 0.0, 0.0),
+          rotation: Vector4(1.0, 0.0, 0.0, 0.0));
+      bool? didAddNodeToAnchor =
+          await this.arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
+      if (didAddNodeToAnchor!) {
         this.nodes.add(newNode);
-      }*/
+      } else {
+        this.arSessionManager!.onError("Adding Node to Anchor failed");
+      }
+    } else {
+      this.arSessionManager!.onError("Adding Anchor failed");
     }
   }
 }
diff --git a/example/lib/examples/screenshotexample.dart b/example/lib/examples/screenshotexample.dart
index dd3cfb5a..b7dce73e 100644
--- a/example/lib/examples/screenshotexample.dart
+++ b/example/lib/examples/screenshotexample.dart
@@ -116,42 +116,29 @@ class _ScreenshotWidgetState extends State<ScreenshotWidget> {
       List<ARHitTestResult> hitTestResults) async {
     var singleHitTestResult = hitTestResults.firstWhere(
         (hitTestResult) => hitTestResult.type == ARHitTestResultType.plane);
-    if (singleHitTestResult != null) {
-      var newAnchor =
-          ARPlaneAnchor(transformation: singleHitTestResult.worldTransform);
-      bool? didAddAnchor = await arAnchorManager!.addAnchor(newAnchor);
-      if (didAddAnchor != null && didAddAnchor) {
-        anchors.add(newAnchor);
-        // Add note to anchor
-        var newNode = ARNode(
-            type: NodeType.webGLB,
-            uri:
-                "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
-            scale: Vector3(0.2, 0.2, 0.2),
-            position: Vector3(0.0, 0.0, 0.0),
-            rotation: Vector4(1.0, 0.0, 0.0, 0.0));
-        bool? didAddNodeToAnchor =
-            await arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
-        
-        if (didAddNodeToAnchor != null && didAddNodeToAnchor) {
-          nodes.add(newNode);
-        } else {
-          arSessionManager!.onError("Adding Node to Anchor failed");
-        }
-      } else {
-        arSessionManager!.onError("Adding Anchor failed");
-      }
-      /*
-      // To add a node to the tapped position without creating an anchor, use the following code (Please mind: the function onRemoveEverything has to be adapted accordingly!):
+    var newAnchor =
+        ARPlaneAnchor(transformation: singleHitTestResult.worldTransform);
+    bool? didAddAnchor = await arAnchorManager!.addAnchor(newAnchor);
+    if (didAddAnchor != null && didAddAnchor) {
+      anchors.add(newAnchor);
+      // Add note to anchor
       var newNode = ARNode(
-          type: NodeType.localGLTF2,
-          uri: "Models/Chicken_01/Chicken_01.gltf",
+          type: NodeType.webGLB,
+          uri:
+              "https://github.com/KhronosGroup/glTF-Sample-Models/raw/master/2.0/Duck/glTF-Binary/Duck.glb",
           scale: Vector3(0.2, 0.2, 0.2),
-          transformation: singleHitTestResult.worldTransform);
-      bool didAddWebNode = await this.arObjectManager.addNode(newNode);
-      if (didAddWebNode) {
-        this.nodes.add(newNode);
-      }*/
+          position: Vector3(0.0, 0.0, 0.0),
+          rotation: Vector4(1.0, 0.0, 0.0, 0.0));
+      bool? didAddNodeToAnchor =
+          await arObjectManager!.addNode(newNode, planeAnchor: newAnchor);
+      
+      if (didAddNodeToAnchor != null && didAddNodeToAnchor) {
+        nodes.add(newNode);
+      } else {
+        arSessionManager!.onError("Adding Node to Anchor failed");
+      }
+    } else {
+      arSessionManager!.onError("Adding Anchor failed");
     }
   }
 }
\ No newline at end of file