Error HTTP 500 when navigating to Chronoforms in backend

I'm not sure when this error started.
I've been using Chronoforms for ages.
I upgraded to Joomla 3.0 about a year ago, and converted everything, and all worked fine.
The site uses various chronoform pages, which all still work.
I have not been into the chronoforms builder (backend) in a long time.

I just tried now. So, I can navigate around ALL the backend joomla components
but when I try to click into Components -> chronoforms
ie http://mydomain/administrator/index.php?option=com_chronoforms

Ie get:
The mydomaine page isn’t working
HTTP ERROR 500

I have the site secured with 'admin tools' by Akeeba, but it's only the chronoforms that I can't navigate to?

Any ideas?

regards
Marek

Hi Marek,

If you have Chronoforms v4 then please install the latest update OVER yours.

Best regards,
Max

Im having the same issue on v6 :/ im doing a dropdown with state and cities and i cant access now :/

Hi huit8,
​
What error message do you see exactly?
​
If you set Site Error Reporting temporarily to Maximum what message do you see then?
​
Bob