Hi Pam and welcome to our community
You mention "HTML Help project". I'm wondering exactly what
your output type is. If it's a compiled .CHM file, I don't believe
the error is an issue, as it isn't seen. So I'm guessing here the
output is WebHelp?
There are some workarounds for this that will indeed prevent
the message from being seen. You can see more about that at the
following links.
Click here to read the
article
Feel free to post back if any of this is unclear.
Sincerely... Rick