Kaltura_Client_Exception thrown

Invalid KS "NTJhMGJmZDk4OWRmZjQ1NzFiM2QyNTU4ZmI5NTE2ZTQxNjA1ZjAyNnwxMDE7OzE0ODE1MjMyNjY7MjsxNDgxNDM2ODY2LjE0NDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"