Views permision -- please help and suggestion

I have two views A and B such that A depend on B. Both of them has the same
permissions.

when I excute

SELECT * FROM A;

ERROR: permission denied for relation B

********** Error **********

ERROR: permission denied for relation B
SQL state: 42501

However, I can do

SELECT * FROM B;

How can I trace this problem, It really confuses me.

Regards