The mpsl compiler takes the view that the severity of this error is not important, only that some error occurred and therefore terminates processing the output files. If permitted to continue, mpsl will delete the corrupt file. An error occurred whose source could not be identified. Such errors are typically detected after operating system operations, such as file io, in which system services, or their c language RTL equivalents, return an error but that error's cause is unspecified. A translation label was referenced, but that label had not been previously assigned.
Syntax errors are deviations from the valid word sequences permitted in the language.