Help -I've broken the admin payment page

I had been doing a lot of work integrating the HSBC payment module and making it work, but somehow which may or may not be linked, I now can't access the admin payment page (where you select which payment options are enabled). I get the attached error.

It used to work, it even worked as I was implementing the hsbc module as I had to access some options in the hsbc module to configure it. The rest of the admin and shop work fine, and you can even make a transaction, it is just the admin page that won't show properly.

Has anyone any ideas what is broken?

You've mistakenly copied or moved a file by the name of "application_bottom.php" into your /includes/modules/payment/ folder.
You'll need to delete that file.

Normally the application_bottom.php file only exists in the /includes/ folder, not in subfolders.

If your custom payment module includes an application_bottom.php file, make sure you put it in the correct place as documented by the module's author.

Spot on Dr Byte - It seems when I moved the files from my test server to the live server I really screwed something up - I compared with a default file structure of zen and found I moved a directory into the level beneath it. Doh - user error, too much head banging trying to get hsbc to work! Which also explains why when I rolled back to a backup the problem persisted (the files were still there).

Many thanks for the help.