Kaltura_Client_Exception thrown

Invalid KS "YzQyNWZkYmNlZTkyMDA2MDRmZjYzZDFkMzg0N2M1NDVkMzk3ZDdjMnwxMDE7OzE0OTA4NDQyNDg7MjsxNDkwNzU3ODQ4LjE4MjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"