From 385adbbd23969384a3ee2a6f17b1fd4c7e7442c3 Mon Sep 17 00:00:00 2001
From: Thomas White <taw@physics.org>
Date: Fri, 1 Apr 2022 11:49:22 +0200
Subject: GUI: Improve an error message

---
 src/gui_import.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/gui_import.c b/src/gui_import.c
index 64832006..3b2ad736 100644
--- a/src/gui_import.c
+++ b/src/gui_import.c
@@ -61,7 +61,9 @@ static void add_all_events(struct crystfelproject *proj,
 
 	events = image_expand_frames(dtempl, filename, &n_events);
 	if ( events == NULL ) {
-		ERROR("Couldn't expand event list\n");
+		ERROR("Couldn't expand event list.  Either the data file(s)"
+		      " are corrupted, or the geometry file does not match"
+		      " their contents.\n");
 		return;
 	}
 
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