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A context error occurs when a goal or declaration appears in the wrong
place. There may or may not be anything wrong with the goal or
declaration as such; the point is that it is out of place. Calling
multifile/1 as a goal is a context error, as is having
:-module/2 anywhere but as the first term in a source file. This
error class is an extension to the ISO Prolog standard.
The SICStus_Error term associated with a context error is
context_error(Goal, ContextType, CommandType)
the context in which the command was attempted.
the type of command that was attempted.