Kaltura_Client_Exception thrown

Invalid KS "N2U2ZTk1YWZhYzQyN2Y3YzI0ZTQ3MmFlNTU1NTI4MWY1NGVjOWY0OHwxMDE7OzE0OTg2NjU2OTI7MjsxNDk4NTc5MjkyLjU4NzM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"