Are you seeing this error in Inventor 2013 or 2014 when you start a new file or open a file?
If so, we can help.
In 2013 Styles were replaced by Appearences. Depending on how you used the Styles settings, this could be a major undertaking to fix while you have actual production work to do.
This is where we can come in and help. CDS can correct these issues for you in all your templates and files for use in 2013 and forward while allowing you to concentrate on production related work.
You can put a band-aid on the error for the time being, but it will need to be addressed eventually. Just like the ribbon menus, we were allowed to still use the old style menus for a couple of releases, now, it's all ribbon menus.
Now's the time to fix this error for good and move forward.
Contact us and we'll take care of this matter for you.
Galen,
I'll email you directly