Unable to Add PCF Control by Editing Name space

Hello

I am unable to load / Add PCF Control after editing Name space and publishing in CRM.

First I have name space as , Which is published fine in CRM 

<control namespace="XrmforyouControls" >

After Updating Namespace as , We are unable to find control in CRM 

<control namespace="PCFControls" >

Please let us know if we are missed anything here 

Thanks in Advance 

James