This issue of 'User Already Deleted' appears due to many reason:
a. If the Mobile Phone has changed the Marg Id of eOrder App will get changed.
b. E-Order App Plan Expired.
c. Salesman deleted.
a. If Mobile Phone has been changed mention the New Marg Id in ebusiness Setup.
b. If E-Order App Plans Expires the user needs to recharge the Plan.
c. Clear App cache.