[xwiki-users] Not able to execute some groovy scrip even after given programming rights to admin user?

I am trying to execute below groovy script thru one of the UI Page String xwikiUser = xwiki.getUser("Scott")//line1 executing String wikiname = xwiki.getXWiki().clearName("Scott", true, true, xcontext.getContext())//line2 // other code which is also not executing but line 2 never executes becoz i dont get control in clearName method. After debugging it i found while xwiki.getXWiki() it checks whether user has programming right rights which returns null. But i have explicitly given the admin user program rights at wiki administartion level. For more debugging information control goes to method i.e public boolean hasProgrammingRights(XWikiContext context) of xwikiAuthServiceImpl.java and line 3 returns false // Once dropPermissions has been called, the document in the // context cannot have programming permission. if (context.hasDroppedPermissions()) { return false;//;line 3 } Not getting how to give proper programming rights to admin user here?