For as much as I understood, I am experiencing the same issue.
I reckon this happened after I renamed the users of my organization. I think what happened is that there was an unfinished task for a particular username that was not complete, which caused a problem once the user was deleted/renamed. I tried to login with another user of the same type but the task is not listed (probably because it was already assigned to the first user). Furthermore, when I try to run the process I’m always prompt to the same form that causes the error, so I’m stuck there. Is there a way to visualize all the activity instances still active and delete them?
After experiencing the same issue, I managed to get rid off this error by regenerating an instantiation form for my Pool.
The error might come from a form you're using on a task and for instantiating your datas. In my case, I was using the same form for both instantiation and for the next task and the same error popped up (I'm on Community 7.14).
While I can't tell you the source of this error, I hope that my answer helps you go around it.
The task is assigned using actor mapping without a filter. Another strange thing is that the username reported in the exception is not the actor that should perform that task (which is associated with another actor).
I do not remember all the steps that brought me to this deadlock. I will test and in case I can reproduce it I will open a bug report. Meanwhile, what will be the best way to overcome this situation? I thought to create a copy of the original diagram from scratch and rename at least the troublesome task and the diagram name.
Thanks in advance.
What you can do is to take a look at the content of flownode_instance table in the Engine database and double check that you don’t have any task with id = 7714204669445061423.
Then you can take a look at arch_flownode_instance and check if you have an entry where sourceObjectId = 7714204669445061423.
It can help to figure out if the task was actually performed or is maybe in failed state…
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