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-rw-r--r--libcrystfel/src/datatemplate.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/datatemplate.c b/libcrystfel/src/datatemplate.c
index df0ad343..643da2ea 100644
--- a/libcrystfel/src/datatemplate.c
+++ b/libcrystfel/src/datatemplate.c
@@ -132,6 +132,8 @@ static int parse_group(const char *name, DataTemplate *dt, const char *val)
gt->children[i] = find_group(dt, members[i]);
if ( gt->children[i] == NULL ) {
ERROR("Unknown panel group '%s'\n", members[i]);
+ ERROR("Make sure the hierarchy groups definitions are AFTER the "
+ "panel definitions in the geometry file.\n");
fail = 1;
}
}