A compiler error that can appear is:
The type of the parameter ${n} is different in the calling and in the called method.

When double clicking the error to see the problem, it may instead show a #DECLARE statement without the numbered parameter the error was complaining about. If this happens, this probably means that the parameter was typed in the compiler method for methods which defaults to the name "Compiler_Methods". Open the method and look for the method name that the error complained about and it should be paired with the numbered parameters in a typing call. The typing call or the problematic method can be updated to the correct type to match each other.

This is an issue that might happen when updating code to utilize the newer #DECLARE statement.