While clicking on Finish and sync its showing “Validate all fields” error. What do I do?

When a field user wants to finish a task but he faces and error message 'Validate all fields' This error occurs when Required fields in an activity form which are Mandatory fields are left blank.

A field user must fill those mandatory fields to 'Finish Y Sync' the task. Check under the FORM tab if any Mandatory field is left blank (specified by Asterisk).

Please fill the mandatory fields to complete the task.

 

Please refer screens more clarity: