From 5b49a0fdc20e72b860ca074a954d69fb1e4ac888 Mon Sep 17 00:00:00 2001
From: Jonas Hahnfeld <jonas.hahnfeld@cern.ch>
Date: Tue, 26 Nov 2024 17:15:53 +0100
Subject: [PATCH] [ntuple] Fix error message for projected subfield

---
 tree/ntuple/v7/src/RNTupleModel.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tree/ntuple/v7/src/RNTupleModel.cxx b/tree/ntuple/v7/src/RNTupleModel.cxx
index 4b5fe8f1aa37d..1d5d75eb8a32b 100644
--- a/tree/ntuple/v7/src/RNTupleModel.cxx
+++ b/tree/ntuple/v7/src/RNTupleModel.cxx
@@ -392,7 +392,7 @@ ROOT::Experimental::RNTupleModel::AddProjectedField(std::unique_ptr<RFieldBase>
    for (const auto &subField : *field) {
       sourceField = FindField(mapping(subField.GetQualifiedFieldName()));
       if (!sourceField)
-         return R__FAIL("no such field: " + mapping(fieldName));
+         return R__FAIL("no such field: " + mapping(subField.GetQualifiedFieldName()));
       fieldMap[&subField] = sourceField;
    }