Kaltura_Client_Exception thrown

Invalid KS "Y2JhNWRmZGIwMDY4N2U4ZTA3NGJlMDA5NmNhNDc1N2VmNTEyYTg2YXwxMDE7OzE0NzUxMTQzODc7MjsxNDc1MDI3OTg3LjY2MTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"