Connection end does not exist

A connection points at a node that is not in the workflow, or at an input the node does not have. The canvas never draws such a connection, so it arises when an agent or tool changes the workflow or when a workflow is imported from a file. The change is refused.

What to do

Point the connection at a node in the workflow and at an input that node has, or remove it. The message names the connection and what it points at.

Where it comes from

Checked before every run, for any node. It is one of the messages checks before a run.