Kaltura_Client_Exception thrown

Invalid KS "YjVjYmFlMjIwMDUwZDgxMGU3ODE0ODljNTI5MmRkY2NmNzEwMDI4N3wxMDE7OzE0OTg1MjMyMzA7MjsxNDk4NDM2ODMwLjgzOTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"