Hi James,
To confirm. This is the first thing you see? Or is it after you attempt to do something in the template manager?
Is job_detail one of your templates?
Are you saving templates as files?
Can you go through your template folders and make sure that they all follow the correct format of template_group_name.group
Also make sure that you have all of your templates named correctly filename.html or .rss or similar
I have seen this issue before and it was because somebody had a space in a template file name because they duplicated a file. In other words they had a file that had a name “index copy.html”. The space was what killed it.