HHC4011: Missing topic id in line "line number" of the file "filename".

Problem: The text popup file contains a line beginning with ".topic" but nothing after that word to indicate what the id for the topic is.

Result: The topic id is forced to the number zero.

Solution: Add a topic id after the ".topic" command.

Note: We could not actually get the compiler to generate this error. Instead, it gave us HHC4012 and specified "" as the topic id.