Kaltura_Client_Exception thrown

Invalid KS "ZWI5ZWQ4MTM4YmY5OGM5YTI3YWNmZjBhMjY3YTk2NmNlMzE2NGQ3NXwxMDE7OzE0NzUyNjE2MDA7MjsxNDc1MTc1MjAwLjczNTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"