Merge pull request #11273 from filecoin-project/fix/wrap-sign-error

fix: cli: Wrap error in wallet sign

cli/wallet.go

@@ -22,6 +22,7 @@ import (
 	"github.com/filecoin-project/go-state-types/network"
 
 	"github.com/filecoin-project/lotus/build"
+	"github.com/filecoin-project/lotus/chain/actors/builtin"
 	"github.com/filecoin-project/lotus/chain/types"
 	"github.com/filecoin-project/lotus/lib/tablewriter"
 )
@@ -459,7 +460,12 @@ var walletSign = &cli.Command{
 		sig, err := api.WalletSign(ctx, addr, msg)
 
 		if err != nil {
-			return err
+			// Check if the address is a multisig address
+			act, actErr := api.StateGetActor(ctx, addr, types.EmptyTSK)
+			if actErr == nil && builtin.IsMultisigActor(act.Code) {
+				return xerrors.Errorf("specified signer address is a multisig actor, it doesn’t have keys to sign transactions. To send a message with a multisig, signers of the multisig need to propose and approve transactions.")
+			}
+			return xerrors.Errorf("failed to sign message: %w", err)
 		}
 
 		sigBytes := append([]byte{byte(sig.Type)}, sig.Data...)