This channel wire does not allow forking, which means the channel wire allows only one writer endpoint and one reader endpoint. This error occurs because parallel For Loop iterations implicitly create multiple writers and readers for a channel. Using this channel wire with parallel For Loops causes a race condition.

To correct this error, replace the channel wire with a template that allows forking or disable parallelism on the For Loop. To disable parallelism on the For Loop, right-click the For Loop, select Configure Iteration Parallelism from the shortcut menu, and remove the checkmark from the Enable loop iteration parallelism checkbox in the For Loop Iteration Parallelism dialog box.