diff --git a/src/runtime_old/error.rs b/src/runtime_old/error.rs
new file mode 100644
index 0000000000000000000000000000000000000000..59bca37f40dc3ddf0db08b6f5c800ded8618b10c
--- /dev/null
+++ b/src/runtime_old/error.rs
@@ -0,0 +1,75 @@
+use crate::common::*;
+
+#[derive(Debug)]
+pub enum ConnectError {
+    BindFailed(SocketAddr),
+    UdpConnectFailed(SocketAddr),
+    TcpInvalidConnect(SocketAddr),
+    PollInitFailed,
+    Timeout,
+    PollFailed,
+    AcceptFailed(SocketAddr),
+    AlreadyConnected,
+    PortPeerPolarityMismatch(PortId),
+    NetEndpointSetupError(SocketAddr, NetEndpointError),
+    SetupAlgMisbehavior,
+}
+#[derive(Eq, PartialEq, Copy, Clone, Debug)]
+pub enum AddComponentError {
+    DuplicatePort(PortId),
+    NoSuchModule,
+    NoSuchComponent,
+    NonPortTypeParameters,
+    CannotMovePort(PortId),
+    WrongNumberOfParamaters { expected: usize },
+    UnknownPort(PortId),
+    WrongPortPolarity { port: PortId, expected_polarity: Polarity },
+    DuplicateMovedPort(PortId),
+}
+////////////////////////
+#[derive(Debug, Clone)]
+pub enum UnrecoverableSyncError {
+    PollFailed,
+    BrokenNetEndpoint { index: usize },
+    BrokenUdpEndpoint { index: usize },
+    MalformedStateError(MalformedStateError),
+}
+#[derive(Debug, Clone)]
+pub enum SyncError {
+    NotConnected,
+    InconsistentProtoComponent(ComponentId),
+    RoundFailure,
+    Unrecoverable(UnrecoverableSyncError),
+}
+#[derive(Debug, Clone)]
+pub enum MalformedStateError {
+    PortCannotPut(PortId),
+    GetterUnknownFor { putter: PortId },
+}
+#[derive(Debug, Clone)]
+pub enum NetEndpointError {
+    MalformedMessage,
+    BrokenNetEndpoint,
+}
+#[derive(Debug)]
+pub enum PortOpError {
+    WrongPolarity,
+    UnknownPolarity,
+    NotConnected,
+    MultipleOpsOnPort,
+    PortUnavailable,
+}
+#[derive(Debug, Eq, PartialEq)]
+pub enum GottenError {
+    NoPreviousRound,
+    PortDidntGet,
+    PreviousSyncFailed,
+}
+#[derive(Debug, Eq, PartialEq)]
+pub struct WrongStateError;
+/////////////////////
+impl From<UnrecoverableSyncError> for SyncError {
+    fn from(e: UnrecoverableSyncError) -> Self {
+        Self::Unrecoverable(e)
+    }
+}