I've recently ran into this error message and I'm not sure what this means. Any feedback is good. Thanks
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Work Item Cancelled>> error occurs when a process lane property or task has setting as Run whosoever has designed/Run whomsoever has started and that account has deactivated.
Below 3 solutions i have tried and all worked.
1. you can reactivated user and please ask him/her to login other wise it wont work or you try loggin if that account exist.
2. For instances to make them run please update lane/task assignments(it can be failling on both as per the assignment) to other one like if it is Run whosoever has designed make it to Run whomsoever has started and vice versa.
3. please go to prcess models published by that deactivated user and republish all then can trigger a new process.