The WinRM client received an HTTP server error status (500), but the remote service did not include any other information about the cause of the failure. For more information, see the about_Remote_Troubleshooting Help topic.
In the event log there are below errors.
An internal server error occurred. The unhandled exception was: System.IO.FileNotFoundException: Could not load file or assembly 'Microsoft.Exchange.FrontEndHttpProxy' or one of its dependencies. The system cannot find the file specified.
Watson report about to be sent for process id: 18948, with parameters: E12IIS, c-RTL-AMD64, 15.00.0516.032, HttpProxy-Oab, mscorlib, S.RuntimeTypeHandle.GetTypeByName, S.IO.FileNotFoundException, 80f2, 04.00.30319.18051.
Just can not load Exchange Management Shell.
I have recovered files from backup by window server 2012.
OS is Window Server 2012 standard and Exchange is Exchange 2013 standard.
Please help.