Give a better error when map doesn't find an asset.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/lib/map_cli.cc b/src/lib/map_cli.cc
index c49964f80..487d1690d 100644
--- a/src/lib/map_cli.cc
+++ b/src/lib/map_cli.cc
@@ -298,7 +298,11 @@ map_cli(int argc, char* argv[], std::function<void (string)> out)
 
 	dcp.resolve_refs(assets);
 	dcp.set_annotation_text(cpls[0]->annotation_text().get_value_or(""));
-	dcp.write_xml(Config::instance()->signer_chain());
+	try {
+		dcp.write_xml(Config::instance()->signer_chain());
+	} catch (dcp::UnresolvedRefError& e) {
+		return String::compose("%1\nPerhaps you need to give a -d parameter to say where this asset is located.", e.what());
+	}
 
 	return {};
 }