Kaltura_Client_Exception thrown

Invalid KS "Njk2MTJiYjVkN2JiNTgzMzE5ODJlODRmZmVjMGIzYzQwNTBhODYxYXwxMDE7OzE0NzUwOTY0NDQ7MjsxNDc1MDEwMDQ0LjY0MDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"