Kaltura_Client_Exception thrown

Invalid KS "NTI1OWQ5ZmYzNjgxMDcyY2Q1YzJhMDk4MTg4ZWIwZjYzYTMyYmQ5NHwxMDE7OzE0OTA0MjMwMjI7MjsxNDkwMzM2NjIyLjU2OTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"