I am updating an old Robohelp file to version 9 and I received the following warning messages.
Error in reading RHFrameStyleMappings.apj file
Open project was cancelled or the application was unable to load database for - Custom Casualty.cpd
Depending on how old you are updating from, you may need to take the following step.
If you aren't using Frame, try this. Create a new blank project in a different folder. This should create a new and empty RHFrameStyleMappings.apj file. Then copy the file to your project where it's posting the error.
Now open the upgraded project and see if all is well.