1. Product Version
Astah Professional 6.8 and all the previous versions

2. Description
HTML Export fails if certain characters shown below are included in Class or Package names.
Class name: Control Characters (Space by Tab key..etc)
Package name : Dot (.)

3. Solution
Please remove these characters or replace them with something else before exporting to HTML

4. Status
This bug will be fixed in the future release.

5. Bug ID
5001

Thank you very much for your report, Bernardo.