When you install a WebShopApps extension in most cases it will run SQL as part of this installation. If your frontend is displaying an error report after install it is likely either this SQL has not run successfully, or you have not copied files across correctly.
Most commonly the reasons for SQL not running are:
- Unique Index Too Long
- SQL has already been run on this server and is causing a conflict by attempting to run twice (this is very rare and only happens when database has been manually modified)
The steps to get site back up and running are:
- Check you have installed both the extension and the Common/Logger libraries that come with it
- Check that all the files were transferred successfully
- Identify the actual error. If just a report number is given then go find the report from var/reports directory under you Magento installation filesystem
- Disable extension, further information here
- Contact WebShopApps Support with your order details, error report and problem seen for us to diagnose the issue