When running install.php or possibly other scripts, the following error message appears at the top of the page.
Notice: Undefined variable: error in e:\sites\heldref\ashop\install.php(2) : eval()'d code on line 30
This error is most likely caused by the php.ini setting register_globals set to Off. Change the setting within the php.ini file or ask your hosting company to do it and then restart PHP on the server.
If register_globals is set to On and the same error message appears, check the setting: error_reporting in the PHP configuration file, php.ini. If it is set to E_ALL, you may see all kinds of meaningless error messages. Change it to E_ALL & ~E_NOTICE and restart PHP to avoid seeing the error messages.