CRM Error – Invalid Action – the selected action was invalid
a) Launch the Services.msc console on the CRM server. (Click Start, then click All Programs, then click on Administrative tools and then select Services.)b) Select the service named "Microsoft CRM Asynchronous Processing Service"
c) Right click the service and select the Start.
Once the Microsoft CRM Asynchronous Processing Service is successfully started, verify that you can now login to Dynamics CRM