IMO, it is not an error, rather it is a warning message indicating that UBC wind analysis results might not be reliable, if the building being analyzed is more than 400 feet high.
This is in accordance with requirements of UBC-97 section 1615, which requires that approved national standards (e.g., ASCE 7 etc), shall be used for wind design of buildings over 400 feet in height, among others.
Moreover,AFAIK, you may still run your model (even after display of this warning message), by pressing OK button again and again (although analysis results might not be acceptable).
Regards.