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Semantic Error: There exists already an idle task in resource '...'

In your project, more than one task of the type 'Idle' is defined in a resource ('PLCnext' node in the PLANT). A resource, however, must not contain more than one idle task.

The task type is set using the 'Tasks and Events' editor.
  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 the suspected task by selecting a different 'Task/Event Type' ('Cyclic' for example) and the corresponding properties.

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