Kaltura_Client_Exception thrown

Invalid KS "NzdkYWM1NzMzOGU5MmMwMTJiOGE1ZjM3Njk5YmM3YzM1MjQ2YmM2ZnwxMDE7OzE0NzUyNjk5MDI7MjsxNDc1MTgzNTAyLjY1MTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"