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Configuration Error (PLCN0010): The task '...' uses the event name value '...', which is reserved for a predefined event.

In your project, an 'Event name' is used in a 'User event task' which is reserved for a system event. Note that these are not the visible system event names but their internal interface names. Which names are reserved depends on the controller because system events (and their interface names) are defined in the device description of the controller.
Such reserved names must not be used for user event tasks.

  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 specifying a valid and unique 'Event name'.
    Make sure that the user event is also renamed accordingly.

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