ID 20464No coupling condition for selected coupling group. Description The number of the coupling group programmed with an axes coupling command (Selection, deselection) is not defined. For further information see [PROG// Section: Synchronous operation] Response Class 2 Abort NC program processing. Solution Class 3 Check and modify NC program. Before selection or deselection the coupling group with the missing number must be defined. Parameter %1: Error value [-] Unknown number of the coupling group Error type 1, Error message from NC program.