Hi, I'm assuming you are reporting problem with jsreportonline from the message.
It seems that the server is receiving rendering request in format { template: { dataJson: ??, .... } }
The dataJson property inside template is not valid. I believe there was a back compatibility hack in this which was removed a week ago.
In every case, you should send data as separate property in request like
{ template: {...}, data { propA: ... } }
I was checking your current templates and didn't find any occurrence of such case. Nor didn't find such call in our code.
Maybe you've fixed your templates in the meantime?
Please feel free to reach me on skype @pofider if this is the production issue so we can faster find the problem.