--- a/configmix/config.py	Wed Aug 16 16:28:42 2023 +0200
+++ b/configmix/config.py	Wed Aug 16 17:04:14 2023 +0200
@@ -1031,7 +1031,7 @@
                 and (s[2] == _FILTER_SEPARATOR)
                 and (start == 0)):
             if s.find(_ENDTOK_FILTER, 3) != (len_s - 3):
-                raise ValueError("`{{|' global filter interpolation must end with `|}}'")
+                raise ValueError("`{{|' nested filter interpolation must end with `|}}'")
             new_s, filters = _split_filters(s[3:-3], -1)
             try:
                 varvalue = self.py_interpolate_variables(new_s)