When you compile a program that uses the insert [colored] file operation, you should test the value of the built-in function ioerror to see if the operation was successful. The value returned by ioerror is a boolean value:  if the operation was successful (there was no failure), the value is false; if it failed, the value is true.

For example:

response to start

    add to Report

        insert file Report

    if ioerror

        then ...

    end if