When I click the install button at Module -> Shipping, and want to change the red dot to green dot. the following error comes:

PHP Warning: reset() [<a href='function.reset'>function.reset</a>]: Passed variable is not an array or object in H:\dwphp2004\store\admin\modules.php on line 306

PHP Warning: Variable passed to each() is not an array or object in H:\dwphp2004\store\admin\modules.php on line 307

Please help.