diff --git a/reserver/reserver_obj.py b/reserver/reserver_obj.py
index 7fec654..20300fd 100644
--- a/reserver/reserver_obj.py
+++ b/reserver/reserver_obj.py
@@ -109,9 +109,12 @@ def upload(self, package_name, user_parameters=None):
                         error = "Invalid or non-existent authentication information(PyPI API Key)."
                     if "400" in error and "too similar to an existing project" in error:
                         error = "Given package name is too similar to an existing project in PyPI."
+                    if "400" in error and "isn't allowed." in error:
+                        error = "Given package name has conflict with the module name of a previously taken package (the taken package itself has a different name, but it's module name has conflict)."
+                    if "400" in error and "isn't allowed (conflict with Python Standard Library" in error:
+                        error = "Given package name has conflict with Python Standard Library module name."
                 break
 
-        # todo remove env variable
         if "TWINE_USERNAME" in environ:
             environ.pop("TWINE_USERNAME")
         if "TWINE_PASSWORD" in environ: