Kaltura_Client_Exception thrown

Invalid KS "MDQ3NWIzMDk5YWI0NGQ1MWU5ZWUwMWIyNmU1MDAxZTUwODMzM2JhYnwxMDE7OzE0OTg0ODcwNjQ7MjsxNDk4NDAwNjY0LjI1OTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"