add error , update kv

executor/kv.go

 package executor
 
-import "fmt"
+import (
+	"fmt"
+
+	pty "gitlab.33.cn/chain33/chain33/plugin/dapp/unfreeze/types"
+)
 
 var (
-	id = "mavl-unfreeze-"
+	id = "mavl-" + pty.UnfreezeX + "-"
 )
 
 func unfreezeID(txHash string) []byte {

types/errors.go

@@ -8,4 +8,5 @@ var (
 	ErrUnfreezeMeans     = errors.New("ErrUnfreezeMeans")
 	ErrUnfreezeID        = errors.New("ErrUnfreezeID")
 	ErrNoUnfreezeItem    = errors.New("ErrNoUnfreezeItem")
+	ErrNoPrivilege       = errors.New("ErrNoPrivilege")
 )
\ No newline at end of file