How to config kong skywalking plugin

[807801002]

I set up the configuration of kong according to https://github.com/apache/skywalking-kong/blob/master/README.md, but it response "{"message":"Not found"}" when I curl http://localhost:8001/plugins/ by following:
curl -X POST --url http://localhost:8001/plugins/
--data 'name=skywalking'
--data 'config.backend_http_uri=http://localhost:12800'
--data 'config.sample_ratio=100'
--data 'config.service_name=kong'
--data 'config.service_instance_name=kong-with-skywalking'
And no data sent to skywalking-oap

[wu-sheng]

Check the Kong's version? Or at least check the logs. Otherwise, we can't help.

[807801002]

kong's version is 2.5.0, no error log at error.log