ChaRM: TOC's not creating (new issue)

Hi all

We are on Solman 7.1 SP12 and Transport of Copies has suddenly stopped working (it was working last week).

In the task list, this is what shows:

You can see it's showing as red although it doesn't say why.

I have looked at the Applications Logs as well and it's showing this:

In the CRM WebClient UI it just shows a similar error to the top screenshot. It show the creation of the TOC as red and when you click on it everything looks green.

What could have caused this? Any suggestions? I don't understand how this could just stop working all of a sudden.

Thanks

Shaun