[AX2012] SSRS Report Error at The Fisrt Time After Restarting AOS

"The DefaultValue expression for the report parameter ‘AX_CompanyName’ contains an error: Request for the permission of type ‘System.Security.Permissions.EnvironmentPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089′ failed. (rsRuntimeErrorInExpression)"

Solution:

1. Go to System administration>Setup>System>System service accounts.
2. Retype the business connector proxy account ("domain\username").