diff --git a/sero/backend.go b/sero/backend.go
index 9691c335..99b87ae7 100644
--- a/sero/backend.go
+++ b/sero/backend.go
@@ -390,10 +390,10 @@ func (s *Sero) StartMining(local bool) error {
 	if !ret {
 		lic_t := c_type.LICr{}
 		if bytes.Equal(lic.Proof[:32], lic_t.Proof[:32]) {
-			log.Error("Cannot start mining , miner license does not exists ", "", "")
+			log.Error("Cannot start mining , miner license does not exists, or coinBase is error", "", "")
 			return fmt.Errorf(" miner license does not exists")
 		} else {
-			log.Error("Cannot start mining ,invalid miner license", "", "")
+			log.Error("Cannot start mining ,invalid miner license, or coinBase is error", "", "")
 			return fmt.Errorf("invalid miner license: %v", common.Bytes2Hex(lic.Proof[:]))
 		}
 	}
diff --git a/zero/stake/sharepool.go b/zero/stake/sharepool.go
index babaa257..d4fb7d74 100644
--- a/zero/stake/sharepool.go
+++ b/zero/stake/sharepool.go
@@ -761,7 +761,7 @@ func (self *StakeState) CheckVotes(block *types.Block, bc blockChain) error {
 		blockPosHash := parentblock.HashPos()
 		for _, vote := range header.ParentVotes {
 			ret := types.StakeHash(&blockPosHash, &parentPosHash, vote.IsPool)
-			if err := self.verifyVote(block.NumberU64(), vote, ret); err != nil {
+			if err := self.verifyVote(parentblock.NumberU64(), vote, ret); err != nil {
 				return err
 			}
 
diff --git a/zero/txtool/flight/sli.go b/zero/txtool/flight/sli.go
index f09f8681..7bf51f41 100644
--- a/zero/txtool/flight/sli.go
+++ b/zero/txtool/flight/sli.go
@@ -20,7 +20,7 @@ func GenTx(param *txtool.GTxParam) (gtx txtool.GTx, e error) {
 	var need_szk = true
 
 	if txtool.Ref_inst.Bc != nil {
-		if txtool.Ref_inst.Bc.GetCurrenHeader().Number.Uint64() < seroparam.SIP5() {
+		if txtool.Ref_inst.Bc.GetCurrenHeader().Number.Uint64()+1 < seroparam.SIP5() {
 			need_szk = false
 		} else {
 			param.Z = &need_szk