Warning cum error "Access Is denied For the user" in DMF AX 2012 R3

Solution:

1. Add the concern user in 'Microsoft Dynamics AX Data Import Export 
Framework Service Users local group'  in server where DMF service is running.

2. Make the directory shared with everyone in read/write privileges.

3. Must restart the server not AOS , Its server (system)

 Note: sometimes it will not be validated until you restart the server.