Hello!

We are trying to install our app for a client on premise and until now everything seemed to work good. The strange part is that now for every task when the user is choosing to cancel the "An unknown error occurred, please contact your administrator” pops up. There is no process flow involved for that task, the deployment was good and execution of the task without cancel work fine.

We checked the live error log, error log but nothing is there and on windows gui is not happening. 

When checking the network/console there we can see that the call failed with status 405 Method not allowed.

Any ideas how we can solve this or what is causing it? We saw this post 

 but is not very helpful since the answer is another question and it feels strange to be from permissions because executing the tasks normally without canceling them works just fine, but maybe we skip something that you can guide us.