The Task Could Not Be Submitted

Question

We are having problems in our production environment where user sees a pink popup saying "The Task Could Not Be Submitted. The task has already been submitted." This error does not happen all the time and happens on different pages of the application every time. This is only happening for a hand full of prod users and is intermittent. I am not able to reproduce the issue in lower environments. We are on Appian 17.2. Can anyone please let me know how I can fix this issue?

Aaron Swerdlow-Freed · Answer

When this pink box appears, it means something has caused the task to no longer be avaliable to the user. This can be for a number of reasons: 
The process has ended or been killed. 
The user does not have the correct permissions to view the task, interface or process. 
The task has already been completed or otherwise removed. 
 
It is likely that you will be able to reproduce the error in a lower environment by using a user with the same permissions rather than an admin user. If you are unable to do so the process logs from prod will likely show that the task/process has been ended or completed.

aloks0189 · Answer

Adding to @Aaron this scenario can also appear when this particular process instance is open in edit mode, make sure while user is acting on the task/ task is active, any production support team is not editing the process else this can also cause this error