Kaltura_Client_Exception thrown

Invalid KS "YmUxMDYwNmE2Y2M5OTY0N2Q4MWVmODE0NGVmN2JiOGFhYjZlOTBmNXwxMDE7OzE0NzUwNTQyNTY7MjsxNDc0OTY3ODU2LjIxNDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"