If your source has been on a network drive it may be too
late. RH uses an MS Access database to keep track of the files and
other elements of your project and these are known to have problems
when run over a network. Sometimes you can end up with a corrupt
file.
What'd I'd do here is take a copy of the project. Then delete
the topics you have added. Attempt to compile. If it works, the
problem is with one of the created topics. Import each file in turn
and compile after each one. This will determine which topic has the
issue.
If the project won't compile at all, try deleting the
project's .CPD file. If this doesn't work, read and follow the
instructions at
this
link..