Error Call to undefined method Closure::handle()

[Suganya209]

Serverless.yml configuration:

functions:
test:
handler: test.php
events:
- httpApi:
method: POST
path: /test

I have started the server using the command, vendor/bin/bref-dev-server

I have called the endpoint by this URL, http://0.0.0.0:8000/test

I'm getting this error,

Error: Call to undefined method Closure::handle() in file /brefproject/vendor/bref/dev-server/src/Handler.php on line 47
Stack trace:

1. Error->() /brefproject/vendor/bref/dev-server/src/Handler.php:47
2. Bref\DevServer\Handler->handleRequest() /brefproject/vendor/bref/dev-server/src/server-handler.php:11

Please tell me how to resolve it.