Try adding the line:
PHP Code:
define('DISABLE_HOOKS', true);
to the top of the file "/includes/config.php" on your server and this will disable your plugins, and perhaps this will allow you back in. Once you fix the issue, then comment out the line you added as follows:
PHP Code:
//define('DISABLE_HOOKS', true);
This way the line of code will be there if you need it in the future.