Kaltura_Client_Exception thrown

Invalid KS "OWEzNWFmMjUzN2JmYTgzOThhNzNlZGJiNGUwYTRmZWExYjFkNjU2MHwxMDE7OzE0OTM0NTM5Mzc7MjsxNDkzMzY3NTM3LjMxMDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"