Kaltura_Client_Exception thrown

Invalid KS "NGM2MGY0YjE2OTk1NmI2YWVmMGY1ZmY1MjU2OTdhYzQxOTY5NjE0M3wxMDE7OzE0OTYwMjczOTU7MjsxNDk1OTQwOTk1LjQ5ODc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"