Invalid Action – The selected action was not valid
Invalid Action – The selected action was not valid. imagine you are working on Microsoft Dynamics CRM without any problem and suddenly you start getting the above error. I am quite sure that you will start abusing Microsoft about it. I would strongly recommend to stop it and start searching.
Invalid Action – The selected action was not valid is a very generic problem and no one will be able to get any information from it. Go to event viewer of the server running Microsoft Dynamics CRM. I am pretty sure that you will find an error under event viewer. The event viewer clearly shows that Microsoft Dynamics CRM key is expired and you need to get a new one. 
There is a very simple way to get a new key. You just need to find the installation directory of Microsoft Dynamics CRM. Why you need to find the installation directory Microsoft Dynamics CRM? you need to run a command to get a new key is the best answer. Please follow the under listed instructions to update the Microsoft Dynamics CRM key.
You need to renew the key manually and everything must be fine after the changes have been implemented.Follow the listed instructions to make the changes.
Open a
Go to installation directory of Dynamics CRM, typically it would be %PROGRAMFILES%\Microsoft Dynamics CRM
- Navigate to the tools directory
- Run the command Microsoft.Crm.Tools.WRPCKeyRenewal.exe /R
- Microsoft Dynamics CRM must be working now.
I hope your problem is solved. if its not solved, please go to services and check if the Async service (maintenance) is running on the Microsoft Dynamics CRM server. If the service is not running, start it. After successfully starting the service, go to your browser and hit the address of Microsoft Dynamics CRM and you will be good to go!!!!!.
