Is it possible to uninstall a module which is causing some errors?
Yes, you can uninstall it, here is the easiest way-

If you have phpmyadmin access then-

You can disable a module via phpMyAdmin by login to phpMyAdmin. Then you must locate the database where Drupal is installed. Once you have done so look for the "system" table. Click and open it. Click to browse the table. Find the record for the module that is causing the problems and select the edit function. Set the status to "0" and save. So this will disable the module, now you can access your site and can easily login to backend and uninstall the module.