Kaltura_Client_Exception thrown

Invalid KS "YjU4NjU1Y2MyZGNkNmZlM2MyOGU3MGEyNGFlMGJmYjI0Mjk4MDE3YnwxMDE7OzE0NzUyNzQ2MjI7MjsxNDc1MTg4MjIyLjIyNzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"