How to free mates to allow movement in assembly?
Here is the full solution. When i looked at the assembly i found that the limit angle mate is creating problem. You have mated it in the hinge rather than Header. Maybe this will help.
Select the Hinge assembly and then component properties.
Change solve as to flexible.
Now the first hinge is working.
Component properties of second hinge assembly.
Change solve as here to flexible also.
Select the hinge face.
Mate it to the face of other hinge.
Choose Parallel. A error will pop up. We will solve it later. Click OK.
Now under the mates of second hinge select limit angle3.
Press Delete. Click Yes.
Now the assembly is working fine.