Sys.InvalidOperationException
Raised by the Microsoft Ajax Library when a call to a method has failed, but the reason was not invalid arguments.
Remarks
When a client function or method is called and an error occurs that is not caused by invalid arguments, a Sys.InvalidOperationException object is created by using the Error.invalidOperation function.
For more information about how to raise this error, see Error.invalidOperation Function.
For more information about how to handle error conditions, see Debugging and Tracing Ajax Applications Overview.