fix_: properly wrap error

services/wallet/token/balancefetcher/balance_fetcher.go

@@ -2,13 +2,14 @@ package balancefetcher
 
 import (
 	"context"
-	"errors"
 	"math/big"
 	"sync"
 	"time"
 
 	"go.uber.org/zap"
 
+	"github.com/pkg/errors"
+
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -69,8 +70,7 @@ func (bf *DefaultBalanceFetcher) fetchBalancesForChain(parent context.Context, c
 
 	ethScanContract, availableAtBlock, err := bf.contractMaker.NewEthScan(client.NetworkID())
 	if err != nil {
-		logutils.ZapLogger().Error("error scanning contract", zap.Error(err))
-		return nil, err
+		return nil, errors.Wrap(err, "error scanning contract")
 	}
 
 	fetchChainBalance := false
@@ -321,6 +321,7 @@ func (bf *DefaultBalanceFetcher) GetBalancesAtByChain(parent context.Context, cl
 		return nil, parent.Err()
 	}
 	if group.Error() != nil {
+		logutils.ZapLogger().Error("failed to get balances by chain", zap.Error(group.Error()))
 		return nil, group.Error()
 	}
 	return response, nil