Kaltura_Client_Exception thrown

Invalid KS "NmY4ZmQ3NGY0N2IzN2MyMmUxZjUxMzhhNjMzZmU1Njk4ZjA0OGZkMXwxMDE7OzE0OTA2MTI1OTg7MjsxNDkwNTI2MTk4LjgxMjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"