Unable to install plugin in grails 2.2.4

[Shubham Sharma]

i am using grails 2.2.4 i looked into grails plugin then i found activity bpm but i am not able to install it . i think that may be some repository issue is occurring.

mavenRepo "https://maven.alfresco.com/nexus/content/groups/public/"  

this path is wrong i feel because after placing in repository section grails try to look activiti plugin in following path

==== https://maven.alfresco.com/nexus/content/groups/public/: tried
	  https://maven.alfresco.com/nexus/content/groups/public/org/grails/plugins/activiti/5.12.1/activiti-5.12.1.pom
	  -- artifact org.grails.plugins#activiti;5.12.1!activiti.zip:
	  https://maven.alfresco.com/nexus/content/groups/public/org/grails/plugins/activiti/5.12.1/activiti-5.12.1.zip
		::::::::::::::::::::::::::::::::::::::::::::::
		::          UNRESOLVED DEPENDENCIES         ::
		::::::::::::::::::::::::::::::::::::::::::::::
		:: org.grails.plugins#activiti;5.12.1: not found
		::::::::::::::::::::::::::::::::::::::::::::::

please help me..