Kaltura_Client_Exception thrown

Invalid KS "ZWNkOWI2Y2U2NDQ4MmMzNWNmNjgyMGMzNmJmMzk1NzU1OGMxYWQ2ZXwxMDE7OzE0NzIxNzQ0NjM7MjsxNDcyMDg4MDYzLjEyMjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"