Kaltura_Client_Exception thrown

Invalid KS "NjExMTdkMDkxMTY4YmFmZjhiYjAwMWMyN2Q4YmFlMzc2NTYzOGNmZnwxMDE7OzE0OTA5OTQyMzQ7MjsxNDkwOTA3ODM0LjE0NzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"