Plugin Error

[SrinivReddy]

while executing marathon --plugin_dir=/etc/marathon/marathon-example-plugins-1.3.5/target/pack/lib --plugin_conf=/etc/marathon/plugins/configuration.json --master=http://master-ip:5050

i am getting below error can you please help me out.

ERROR Terminating due to uncaught exception in thread main:1 (mesosphere.marathon.MarathonApp:main) com.google.inject.CreationException: Unable to create injector, see the following errors:

1. Error injecting constructor, mesosphere.marathon.WrongConfigurationException: Plugin not found: PluginDefinition(authentication,mesosphere.marathon.plugin.auth.Authenticator,mesosphere.marathon.example.plugin.auth.ExampleAuthenticator,None,Some({"users"...........

configuration.json file is below, implementation filed what to mention in exampleAuthorizer, Authenticator.... { "plugins": { "authorization": { "plugin": "mesosphere.marathon.plugin.auth.Authorizer", "implementation": "mesosphere.marathon.example.plugin.auth.ExampleAuthorizer" }, "authentication": { "plugin": "mesosphere.marathon.plugin.auth.Authenticator", "implementation": "mesosphere.marathon.example.plugin.auth.ExampleAuthenticator", "configuration": { "users": [ { "user": "user", "password": "user", "permissions": [ { "allowed": "create", "on": "/dev/" }, { "allowed": "view", "on": "/dev/" } ] }, { "user": "user1", "password": "user1", "permissions": [ { "allowed": "update", "on": "/prod/" }, { "allowed": "delete", "on": "/prod/" } ] }, { "user": "user2", "password": "user2", "permissions": [ { "allowed": "create", "on": "/prod/" }, { "allowed": "update", "on": "/prod/" }, { "allowed": "delete", "on": "/dev/" }, { "allowed": "view", "on": "/dev/" } ] }, { "user": "user3", "password": "user3", "permissions": [ { "allowed": "create", "on": "/" }, { "allowed": "update", "on": "/" }, { "allowed": "delete", "on": "/" }, { "allowed": "view", "on": "/" } ] } ] } } } }