Kaltura_Client_Exception thrown

Invalid KS "ZTAyN2VlYTExYzRhODgxOGMxMjg1Njc0ODBjZmFiNjI5MTAyZjkyMnwxMDE7OzE0ODUwOTIyNTc7MjsxNDg1MDA1ODU3LjE0NDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"