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-rw-r--r--src/gui_import.c4
1 files changed, 3 insertions, 1 deletions
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;
}