As of version 4, HelpSpot can be configured to display more useful error messages. To enable debugging, edit your config.php file and add or change the cDEBUG option to appear like so:
This will do two things:
Errors occurring within HelpSpot will be displayed in a error-reporting screen that shows the error, the file, and related information
Errors occurring within HelpSpot will be logged to the data/log/helpspot.log file
Let us know what you see then on that error page.