diff --git a/seahub/api2/views.py b/seahub/api2/views.py
index 251076a638..716fa21a78 100644
--- a/seahub/api2/views.py
+++ b/seahub/api2/views.py
@@ -1846,7 +1846,7 @@ class OwaFileView(APIView):
         filename = os.path.basename(path)
         filetype, fileext = get_file_type_and_ext(filename)
         if fileext not in OFFICE_WEB_APP_FILE_EXTENSION:
-            error_msg = 'file extension invalid.'
+            error_msg = 'path invalid.'
             return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
 
         # get wopi dict