diff --git a/src/runtime/error.rs b/src/runtime/error.rs
index 672a3d6554cb00feecfe4579beed4fbe9111c55b..7de8323c2e0d468fbcf03a6b55ef1b8dd1d0b437 100644
--- a/src/runtime/error.rs
+++ b/src/runtime/error.rs
@@ -19,3 +19,10 @@ pub enum SyncError {
     InconsistentProtoComponent(ProtoComponentId),
     IndistinguishableBatches([usize; 2]),
 }
+#[derive(Debug)]
+pub enum PortOpError {
+    WrongPolarity,
+    NotConnected,
+    MultipleOpsOnPort,
+    PortUnavailable,
+}