1 files changed, 4 insertions, 0 deletions
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index 99035b85..6dbfc468 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -58,6 +58,10 @@ pub mod errors {
                 description("editgroup was already accepted")
                 display("attempted to accept an editgroup which was already accepted: {}", id)
             }
+            MissingOrMultipleExternalId(message: String) {
+                description("external identifiers missing or multiple specified")
+                display("external identifiers missing or multiple specified; please supply exactly one")
+            }
         }
     }
 }