--- a/src/eric7/Project/Project.py	Wed Nov 30 10:11:55 2022 +0100
+++ b/src/eric7/Project/Project.py	Wed Nov 30 16:18:49 2022 +0100
@@ -244,7 +244,7 @@
                 self.tr(
                     "<p>The file category <b>{0}</b> has already been added. This"
                     " attempt will be ignored.</p>"
-                ),
+                ).format(category),
             )
         else:
             self.__fileCategoriesRepository[category] = categoryItem