groovysh_evaluate: 3: unable to resolve class GremlinPipeline 

while run following code in gremlin.sh

> gvz = { GremlinPipeline pipeline -> new com.tinkerpop.gvz.jung.JungViewer(new com.tinkerpop.gvz.GremlinPipelineAnalyzer(pipeline)) }


errors reported:

> groovysh_evaluate: 3: unable to resolve class GremlinPipeline