When you have defined or modified an external function, you must compile it before you can execute it.
To compile your external function, perform one of the following actions
Select the Compile Function command from the Functions menu.
Press the F8 key.
The external function is then compiled. The first error that is detected is highlighted and the corresponding error message is displayed in the status line, to enable you to amend the code.
When the method is compiled and no errors are detected, the message Compilation complete - no errors is displayed in the status line.