Kaltura_Client_Exception thrown

Invalid KS "OWNhYjA0YjRmMzlkMTY1NjFjYjZhNDIwYjEwMWIwZWZhN2VmMDBlZXwxMDE7OzE0OTA3MDY1NDU7MjsxNDkwNjIwMTQ1LjM1MzY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"