Kaltura_Client_Exception thrown

Invalid KS "MjUzMmM0MGU2MTEzOWQ4YmVjMTAxYTY5NGZkNDZiYjg2NTY3MWI0MnwxMDE7OzE0OTg3OTA2MTM7MjsxNDk4NzA0MjEzLjg1OTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"