I currently have flows in Nintex that run when the list item is created. Once the item is created in the list, two things happen:

1 That it tries to start the flow, but does not execute any action and gets the following error:

pFlow Name] failed to start.

2 The flow starts, the tasks are created for the users but at the moment the first task is approved, the flow produces the following error:

The TFlow Name] workflow was canceled by System Account.