diff --git a/routers/hat/repo/file.go b/routers/hat/repo/file.go
index f990f12..63007d5 100644
--- a/routers/hat/repo/file.go
+++ b/routers/hat/repo/file.go
@@ -137,12 +137,12 @@ func GetReadmeContents(ctx *context.APIContext) {
 	readmeSortArr := []string{"readme", "readme.en.md", "readme_en.md", "readme.md", "readme.ch.md", "readme_ch.md", "readme.zh.md", "readme_zh.md", "readme.cn.md", "readme_cn.md"}
 	readmePath := ""
 	readmePathInArrIndex := 0
-	filesListInterface, err := files_service.GetContentsOrList(ctx, ctx.Repo.Repository, "", ref)
+	filesListInterface, err := hat_files_service.GetContentsOrList(ctx, ctx.Repo.Repository, "", ref)
 	if err != nil {
 		ctx.Error(http.StatusInternalServerError, "GetContentsOrList", err)
 		return
 	}
-	filesList, ok := filesListInterface.([]*api.ContentsResponse)
+	filesList, ok := filesListInterface.([]*hat_api.ContentsResponse)
 	if ok {
 		for _, file := range filesList {
 			for i, sortItem := range readmeSortArr {
diff --git a/services/repository/files/content.go b/services/repository/files/content.go
index 0705b20..fee9a61 100644
--- a/services/repository/files/content.go
+++ b/services/repository/files/content.go
@@ -134,21 +134,24 @@ func GetContents(ctx context.Context, repo *repo_model.Repository, treePath, ref
 	if err != nil {
 		return nil, err
 	}
+	var isTextFile = false
 
-	blob, err := gitRepo.GetBlob(entry.ID.String())
-	if err != nil {
-		return nil, err
-	}
-	dataRc, err := blob.DataAsync()
-	if err != nil {
-		return nil, err
-	}
-	buf := make([]byte, 1024)
-	n, _ := util.ReadAtMost(dataRc, buf)
-	buf = buf[:n]
+	if !entry.IsSubModule() {
+		blob, err := gitRepo.GetBlob(entry.ID.String())
+		if err != nil {
+			return nil, err
+		}
+		dataRc, err := blob.DataAsync()
+		if err != nil {
+			return nil, err
+		}
+		buf := make([]byte, 1024)
+		n, _ := util.ReadAtMost(dataRc, buf)
+		buf = buf[:n]
 
-	st := typesniffer.DetectContentType(buf)
-	isTextFile := st.IsText()
+		st := typesniffer.DetectContentType(buf)
+		isTextFile = st.IsText()
+	}
 
 	contentsResponse := &hat_api.ContentsResponse{
 		ContentsResponse: &gitea_api.ContentsResponse{