From looking at the code, it's definitely either something with that mod or something that happened during the installation (something would have had to have been accidentally deleted).
The reason you're getting that error is from this:
- Code: Select all
That is trying to show an element with an id of qr_showeditor_div, which doesn't exist on the page (hence the error). If you could link me to the QR mod you have installed I can check out the edits it has quick and maybe find what's up.