Getting everytime somebody login errors!

warning: array_keys() [function.array-keys]: The first argument should be an array in C:\apache\htdocs\social\modules\user\user.module on line 378.
warning: array_fill() [function.array-fill]: Number of elements must be positive in C:\apache\htdocs\social\modules\user\user.module on line 379.
warning: implode() [function.implode]: Invalid arguments passed in C:\apache\htdocs\social\modules\user\user.module on line 379.
user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 query: SELECT DISTINCT(p.perm) FROM role r INNER JOIN permission p ON p.rid = r.rid WHERE r.rid IN () in C:\apache\htdocs\social\includes\database.mysql.inc on line 172.