Problems Publishing A Template To Message Center
Hello.
I'm trying to make changes to an already published Message Center template but when I try and save the template I get the below error message.

To get around this I can re-upload the images and then save. However, when I try and republish the template I get the below error message.

When I look in the logs it shows the below error messages...

This is very strange as I've made numerous changes to this template and republished before and all I'm trying to change is some text in the template. I've tried stripping out all the HTML code and saving it and republishing it to see if there was something in there it didn't like but getting the same errors.
Any ideas on why this is happening?
Thanks.
Luke.