Kaltura_Client_Exception thrown

Invalid KS "ZmYxZTc2NmVmZGYwM2VjZmNjNGJlNTY3MGM0Zjc5NzBiNTFiNGE2Y3wxMDE7OzE0OTg0OTc5NjE7MjsxNDk4NDExNTYxLjIyMzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"