Flow logic of dynpro & & contains errors; check the syntax

What causes this issue?

You chose <LS>Check -> Consistency</>.
The syntax errors in the flow logic of the screen to be chekced are so
serious that the consistency check is either not meaningful or not
possible at all.

System Response

Consistency check terminated.

How to fix this error?

Choose <LS>Check -> Syntax</>. Eliminate the syntax errors in the flow
logic and repeat the consistency check.

Error message extract from SAP system. Copyright SAP SE.