Task form does not move forward after attempting to complete the task in Business Central of BPMS 6

Issue

• It has been observed that after a process with it's task forms have been created and the process is deployed, the task form comes as expected in Business Central after starting up a process instance. But once, the the task form is filled and while it is attempted to submit it to complete the task, the screen never moves forward and stays as it is. Also, no error message could be seen in the log files. How to fix this problem?