Kaltura_Client_Exception thrown

Invalid KS "NTdhNTM5NmUwNTc4MDVmNWUwMzNjOTkwMTE3Mzk3YTZkZmQ3NWYzOXwxMDE7OzE0OTM2OTI1NTI7MjsxNDkzNjA2MTUyLjY4MTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"