diff --git a/x/lightclient/types/errors.go b/x/lightclient/types/errors.go
index fe53871821..b4f5d93d94 100644
--- a/x/lightclient/types/errors.go
+++ b/x/lightclient/types/errors.go
@@ -13,4 +13,5 @@ var (
 	ErrBlockHeaderNotFound             = errorsmod.Register(ModuleName, 1108, "block header not found")
 	ErrProofVerificationFailed         = errorsmod.Register(ModuleName, 1109, "proof verification failed")
 	ErrInvalidHeight                   = errorsmod.Register(ModuleName, 1110, "invalid height")
+	ErrInvalidBlockHeader              = errorsmod.Register(ModuleName, 1111, "invalid block header")
 )
diff --git a/x/observer/keeper/msg_server_vote_block_header.go b/x/observer/keeper/msg_server_vote_block_header.go
index c14c56a06b..a9050e7ebc 100644
--- a/x/observer/keeper/msg_server_vote_block_header.go
+++ b/x/observer/keeper/msg_server_vote_block_header.go
@@ -5,6 +5,7 @@ import (
 
 	cosmoserrors "cosmossdk.io/errors"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	lightclienttypes "github.com/zeta-chain/zetacore/x/lightclient/types"
 	"github.com/zeta-chain/zetacore/x/observer/types"
 )
 
@@ -26,7 +27,7 @@ func (k msgServer) VoteBlockHeader(goCtx context.Context, msg *types.MsgVoteBloc
 	// check the new block header is valid
 	parentHash, err := k.lightclientKeeper.CheckNewBlockHeader(ctx, msg.ChainId, msg.BlockHash, msg.Height, msg.Header)
 	if err != nil {
-		return nil, cosmoserrors.Wrap(types.ErrInvalidBlockHeader, err.Error())
+		return nil, cosmoserrors.Wrap(lightclienttypes.ErrInvalidBlockHeader, err.Error())
 	}
 
 	// add vote to ballot
diff --git a/x/observer/keeper/msg_server_vote_block_header_test.go b/x/observer/keeper/msg_server_vote_block_header_test.go
index ae89bd984b..161d26ff5a 100644
--- a/x/observer/keeper/msg_server_vote_block_header_test.go
+++ b/x/observer/keeper/msg_server_vote_block_header_test.go
@@ -12,6 +12,7 @@ import (
 	keepertest "github.com/zeta-chain/zetacore/testutil/keeper"
 	mocks "github.com/zeta-chain/zetacore/testutil/keeper/mocks/observer"
 	"github.com/zeta-chain/zetacore/testutil/sample"
+	lightclienttypes "github.com/zeta-chain/zetacore/x/lightclient/types"
 	"github.com/zeta-chain/zetacore/x/observer/keeper"
 	"github.com/zeta-chain/zetacore/x/observer/types"
 )
@@ -118,7 +119,7 @@ func TestMsgServer_VoteBlockHeader(t *testing.T) {
 			Header:    proofs.HeaderData{},
 		})
 
-		require.ErrorIs(t, err, types.ErrInvalidBlockHeader)
+		require.ErrorIs(t, err, lightclienttypes.ErrInvalidBlockHeader)
 	})
 
 	t.Run("can create a new ballot, vote and finalize", func(t *testing.T) {
diff --git a/x/observer/types/errors.go b/x/observer/types/errors.go
index 5e90558d34..1c03f9bbf9 100644
--- a/x/observer/types/errors.go
+++ b/x/observer/types/errors.go
@@ -20,19 +20,17 @@ var (
 	ErrKeygenBlockTooLow = errorsmod.Register(ModuleName, 1114, "please set a block number at-least 10 blocks higher than the current block number")
 	ErrKeygenCompleted   = errorsmod.Register(ModuleName, 1115, "keygen already completed")
 
-	ErrBlockHeaderVerificationDisabled = errorsmod.Register(ModuleName, 1122, "block header verification is disabled")
-	ErrLastObserverCountNotFound       = errorsmod.Register(ModuleName, 1123, "last observer count not found")
-	ErrUpdateObserver                  = errorsmod.Register(ModuleName, 1124, "unable to update observer")
-	ErrNodeAccountNotFound             = errorsmod.Register(ModuleName, 1125, "node account not found")
-	ErrInvalidChainParams              = errorsmod.Register(ModuleName, 1126, "invalid chain params")
-	ErrChainParamsNotFound             = errorsmod.Register(ModuleName, 1127, "chain params not found")
-	ErrParamsMinObserverDelegation     = errorsmod.Register(ModuleName, 1128, "min observer delegation cannot be nil")
-	ErrMinDelegationNotFound           = errorsmod.Register(ModuleName, 1129, "min delegation not found")
-	ErrObserverSetNotFound             = errorsmod.Register(ModuleName, 1130, "observer set not found")
-	ErrTssNotFound                     = errorsmod.Register(ModuleName, 1131, "tss not found")
+	ErrLastObserverCountNotFound   = errorsmod.Register(ModuleName, 1123, "last observer count not found")
+	ErrUpdateObserver              = errorsmod.Register(ModuleName, 1124, "unable to update observer")
+	ErrNodeAccountNotFound         = errorsmod.Register(ModuleName, 1125, "node account not found")
+	ErrInvalidChainParams          = errorsmod.Register(ModuleName, 1126, "invalid chain params")
+	ErrChainParamsNotFound         = errorsmod.Register(ModuleName, 1127, "chain params not found")
+	ErrParamsMinObserverDelegation = errorsmod.Register(ModuleName, 1128, "min observer delegation cannot be nil")
+	ErrMinDelegationNotFound       = errorsmod.Register(ModuleName, 1129, "min delegation not found")
+	ErrObserverSetNotFound         = errorsmod.Register(ModuleName, 1130, "observer set not found")
+	ErrTssNotFound                 = errorsmod.Register(ModuleName, 1131, "tss not found")
 
 	ErrInboundDisabled      = errorsmod.Register(ModuleName, 1132, "inbound tx processing is disabled")
 	ErrInvalidZetaCoinTypes = errorsmod.Register(ModuleName, 1133, "invalid zeta coin types")
 	ErrNotObserver          = errorsmod.Register(ModuleName, 1134, "sender is not an observer")
-	ErrInvalidBlockHeader   = errorsmod.Register(ModuleName, 1135, "invalid block header")
 )