From 6e29a72a19a5b50728f665ff99441a3b514e7fa9 Mon Sep 17 00:00:00 2001
From: tmadlener <thomas.madlener@desy.de>
Date: Thu, 9 Nov 2023 11:57:45 +0100
Subject: [PATCH] Use new functionality to give a more precise error

---
 k4FWCore/components/PodioOutput.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/k4FWCore/components/PodioOutput.cpp b/k4FWCore/components/PodioOutput.cpp
index 3a343f12..0bf54842 100644
--- a/k4FWCore/components/PodioOutput.cpp
+++ b/k4FWCore/components/PodioOutput.cpp
@@ -59,8 +59,16 @@ StatusCode PodioOutput::execute() {
   } else {
     try {
       m_framewriter->writeFrame(frame, "events", m_collection_names_to_write);
-    } catch (std::runtime_error& e) {
-      error() << "Could not write event: " << e.what() << endmsg;
+    } catch (std::runtime_error&) {
+      const auto& [missing, _] = m_framewriter->checkConsistency(m_collection_names_to_write, "events");
+      error() << "Could not write event, because the following collections are not present: ";
+      std::string sep = "";
+      for (const auto& n : missing) {
+        error() << sep << n;
+        sep = ", ";
+      }
+      error() << endmsg;
+
       return StatusCode::FAILURE;
     }
   }