Kaltura_Client_Exception thrown

Invalid KS "MTE5YTUwZjIyMGZhMjNjOTQxYWZiNzk5ZTVmNWIwNmE3OGJmMDFlOXwxMDE7OzE0ODgyODkyMTA7MjsxNDg4MjAyODEwLjA0OTk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"