You may be trying to compile a file with an incompatible file format. Silk Test Classic supports three file formats: ANSI, UTF-8, and Unicode. If you try to compile files in Silk Test Classic that are in other formats, such as DBCS, you will get compile errors.
Workaround: In a Unicode-enabled text editor, save the file in one of the Silk Test Classic supported file formats: ANSI, UTF-8 or Unicode.