Kaltura_Client_Exception thrown

Invalid KS "ZWVhZjk1NWQ4YTA2NjhmZmE1Zjk0MzUwMTNkMWYwZTIyM2QwNTIwOXwxMDE7OzE0ODc3NDE1Mzc7MjsxNDg3NjU1MTM3Ljg0NDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"