Parallel For Loop cannot contain a stacked shift register

This error occurs because you cannot configure For Loops with stacked shift registers to run in parallel instances.

To correct this error, remove all extra elements from the shift register 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.