The certificate used to sign the message was issued by a certificate authority whose own certificate has expired. Make sure your computer's clock is set correctly.
Chaidh an teisteanas leis a chaidh an teachdaireachd a shoidhneadh fhoillseachadh le ùghdarras theisteanasan aig a bheil teisteanas a dh'fhalbh an ùine air. Dèan cinnteach gu bheil an t-àm a nochdas uaireadair a’ choimpiutair agad ceart.