If you install the ProScan version 2.0 templates into an application that already had ProScan in it, you may see this error when you compile:
This error is because the class files are trying to reference a local variable that has been added to the ProScan procedure.
To correct the problem you can either use the Utility Template to re-import the ProScan procedures (be sure to select the Replace All option), or you can add the local var to the procedure yourself as follows:
Compile Errors after updating to Version 3.0
See here.