Kaltura_Client_Exception thrown

Invalid KS "YmYzYjU2NmY3MWJkYzgzMzRhMjI0MjU0OGRmZWM4YmEwNjk5NjI5M3wxMDE7OzE0OTMzODQ3MDQ7MjsxNDkzMjk4MzA0LjI2MTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"