Kaltura_Client_Exception thrown

Invalid KS "Njk0MzY1ZmJlNjAzODA5MjFkZjI4NWU5YTUwYjI4Yzc3MzZmOWViMHwxMDE7OzE0NjczODM2NDk7MjsxNDY3Mjk3MjQ5LjU1MDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"