Kaltura_Client_Exception thrown

Invalid KS "YmIzYTdkMTk3NWYyMmI4NjI1ZWJlODdhNTI4NDU3NGQzMmJkNDFjY3wxMDE7OzE1MDA5MzA2MTY7MjsxNTAwODQ0MjE2LjQxODQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"