If you have recently posted a shift and are trying to take it back, or if the shift was just dropped by someone else, the system may temporarily "glitch" while updating the roster.
Based on available references, here’s what is generally known: wfm-14-7 error code target
Go to your phone's Settings > Apps > myTime > Storage and select Clear Cache to resolve potential data corruption. If you have recently posted a shift and
Sometimes WFM errors are triggered by an expired session. If you haven't updated your password wfm-14-7 error code target