Kaltura_Client_Exception thrown

Invalid KS "NDg4MmY0MmY4YjI5NGM3YjcxMjA5NjYxODgzOWQwMGMxOWRlYmIxMXwxMDE7OzE0Njk3ODE0NjQ7MjsxNDY5Njk1MDY0LjQ1MTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"