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Semantic Error: The task '...' must not use a UserEvent that is already used.

In your project, the same 'Event Subtype' is used in two user tasks of the type 'User Event'. However, an event subtype must not be assigned to more than one task in the project.

The error message appears for each task processing the same event subtype.

  1. Double-click the error message to open the 'Tasks and Events' editor of the 'PLCnext' node in the PLANT. The suspected table line is marked.
  2. Modify one of the suspected tasks by selecting a different 'Event Subtype'.

Further Info
For further information on tasks and how to edit them refer to the topic "Task Configuration".