Running CRM 2011 On-Premise, when attempting to import either managed or un-managed solutions, the screen just sits with no progress forever:
Windows event viewer shows the following event:
InternalOperationPlugin: Could not find method 'ImportSolutionSkipCapable' on 'Microsoft.Crm.WebServices.ImportXmlService'.;Hash='1595594188'
Have Googled this error but everything I've found has dealt with CRM4.0 not 2011 and no real solution
Any help would be appreciated