diff --git a/core/maingate.go b/core/maingate.go
index 1f22c67..4883098 100644
--- a/core/maingate.go
+++ b/core/maingate.go
@@ -13,6 +13,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"runtime/debug"
 	"strings"
 	"sync/atomic"
 	"time"
@@ -207,7 +208,6 @@ func New(ctx context.Context) (*Maingate, error) {
 
 	err := mg.prepare(ctx)
 	if err != nil {
-		logger.Error("mg.prepare() failed :", err)
 		return nil, err
 	}
 
@@ -287,95 +287,98 @@ func (mg *Maingate) discoverOpenIdConfiguration(name string, url string) error {
 
 }
 
+func makeErrorWithStack(err error) error {
+	return fmt.Errorf("%s\n%s", err.Error(), string(debug.Stack()))
+}
+
 func (mg *Maingate) prepare(context context.Context) (err error) {
 	if err := mg.discoverOpenIdConfiguration(AuthPlatformMicrosoft, "https://login.microsoftonline.com/common/v2.0/.well-known/openid-configuration"); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 	if err := mg.discoverOpenIdConfiguration("google", "https://accounts.google.com/.well-known/openid-configuration"); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	// redis에서 env를 가져온 후에
 	mg.mongoClient, err = gocommon.NewMongoClient(context, mg.Mongo, "maingate")
 	if err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionAuth, map[string]bson.D{
 		"skonly": {{Key: "sk", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionLink, map[string]bson.D{
 		"platformuid": {{Key: "platform", Value: 1}, {Key: "uid", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionLink, map[string]bson.D{
 		"emailplatform": {{Key: "email", Value: 1}, {Key: "platform", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeIndices(CollectionAccount, map[string]bson.D{
 		"accid": {{Key: "accid", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionFile, map[string]bson.D{
 		"keyonly": {{Key: "key", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	// Delete대신 _ts로 expire시킴. pipeline에 삭제 알려주기 위함
 	if err = mg.mongoClient.MakeExpireIndex(CollectionWhitelist, 10); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeExpireIndex(CollectionAuth, int32(mg.SessionTTL+300)); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if *devflag {
-		if err = mg.mongoClient.DropIndex(CollectionBlock, "codeaccid"); err != nil {
-			return err
-		}
+		// 에러 체크하지 말것
+		mg.mongoClient.DropIndex(CollectionBlock, "codeaccid")
 	}
 
 	if err = mg.mongoClient.MakeExpireIndex(CollectionBlock, int32(3)); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionPlatformLoginToken, map[string]bson.D{
 		"platformauthtoken": {{Key: "platform", Value: 1}, {Key: "key", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeExpireIndex(CollectionPlatformLoginToken, int32(mg.SessionTTL+300)); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionUserToken, map[string]bson.D{
 		"platformusertoken": {{Key: "platform", Value: 1}, {Key: "userid", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionGamepotUserInfo, map[string]bson.D{
 		"gamepotuserid": {{Key: "gamepotuserid", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	if err = mg.mongoClient.MakeUniqueIndices(CollectionFirebaseUserInfo, map[string]bson.D{
 		"firebaseuserid": {{Key: "firebaseuserid", Value: 1}},
 	}); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	mg.auths = makeAuthCollection(mg.mongoClient, time.Duration(mg.SessionTTL*int64(time.Second)))
@@ -387,7 +390,7 @@ func (mg *Maingate) prepare(context context.Context) (err error) {
 	if err = mg.mongoClient.FindAllAs(CollectionFile, nil, &preall, options.Find().SetProjection(bson.M{
 		"link": 1,
 	})); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 
 	for _, pre := range preall {
@@ -402,23 +405,23 @@ func (mg *Maingate) prepare(context context.Context) (err error) {
 			"_id": pre.Id,
 		}, &fulldoc)
 		if err != nil {
-			return err
+			return makeErrorWithStack(err)
 		}
 		err = fulldoc.Save()
 		if err != nil {
-			return err
+			return makeErrorWithStack(err)
 		}
 	}
 
 	var whites []*whitelistmember
 	if err := mg.mongoClient.AllAs(CollectionWhitelist, &whites, options.Find().SetReturnKey(false)); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 	mg.wl.init(whites)
 
 	var blocks []*blockinfo
 	if err := mg.mongoClient.AllAs(CollectionBlock, &blocks); err != nil {
-		return err
+		return makeErrorWithStack(err)
 	}
 	mg.bl.init(blocks)