Kaltura_Client_Exception thrown

Invalid KS "OTk5ZGQyODhiOGYzYzRjZjg4OWZkNmZlYTRmNzI3NGRkNzM3NzRiNHwxMDE7OzE0NzQ4NjkxOTU7MjsxNDc0NzgyNzk1Ljc2OTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"