Timesheet not generate issue

Hello all,
I created project and on projects I added its different task. task assign to different user. user worked on that task that working functionality.
But while creating timesheet that function not works. I can’t create new timesheet that gives me an error which is « you are not authorized to create this resource. »
and gives the all permission to timesheet module then that not works.
Can anyone help me how to create task timesheet.