diff --git a/Sources/ZcashLightClientKit/Error/ZcashError.swift b/Sources/ZcashLightClientKit/Error/ZcashError.swift
index 8fcdfb08..a0a99f1f 100644
--- a/Sources/ZcashLightClientKit/Error/ZcashError.swift
+++ b/Sources/ZcashLightClientKit/Error/ZcashError.swift
@@ -584,6 +584,12 @@ public enum ZcashError: Equatable, Error {
     /// Indicates that this Synchronizer is disconnected from its lightwalletd server.
     /// ZSYNCO0006
     case synchronizerDisconnected
+    /// The attempt to switch endpoints failed. Check that the hostname and port are correct, and are formatted as <hostname>:<port>.
+    /// ZSYNCO0007
+    case synchronizerServerSwitch
+    /// The spending key does not belong to the wallet.
+    /// ZSYNCO0008
+    case synchronizerSpendingKeyDoesNotBelongToTheWallet
 
     public var message: String {
         switch self {
@@ -754,6 +760,8 @@ public enum ZcashError: Equatable, Error {
         case .synchronizerLatestUTXOsInvalidTAddress: return "LatestUTXOs for the address failed, invalid t-address."
         case .synchronizerRewindUnknownArchorHeight: return "Rewind failed, unknown archor height"
         case .synchronizerDisconnected: return "Indicates that this Synchronizer is disconnected from its lightwalletd server."
+        case .synchronizerServerSwitch: return "The attempt to switch endpoints failed. Check that the hostname and port are correct, and are formatted as <hostname>:<port>."
+        case .synchronizerSpendingKeyDoesNotBelongToTheWallet: return "The spending key does not belong to the wallet."
         }
     }
 
@@ -926,6 +934,8 @@ public enum ZcashError: Equatable, Error {
         case .synchronizerLatestUTXOsInvalidTAddress: return .synchronizerLatestUTXOsInvalidTAddress
         case .synchronizerRewindUnknownArchorHeight: return .synchronizerRewindUnknownArchorHeight
         case .synchronizerDisconnected: return .synchronizerDisconnected
+        case .synchronizerServerSwitch: return .synchronizerServerSwitch
+        case .synchronizerSpendingKeyDoesNotBelongToTheWallet: return .synchronizerSpendingKeyDoesNotBelongToTheWallet
         }
     }
 
diff --git a/Sources/ZcashLightClientKit/Error/ZcashErrorCode.swift b/Sources/ZcashLightClientKit/Error/ZcashErrorCode.swift
index 0bc50a73..24dbb96b 100644
--- a/Sources/ZcashLightClientKit/Error/ZcashErrorCode.swift
+++ b/Sources/ZcashLightClientKit/Error/ZcashErrorCode.swift
@@ -343,4 +343,8 @@ public enum ZcashErrorCode: String {
     case synchronizerRewindUnknownArchorHeight = "ZSYNCO0005"
     /// Indicates that this Synchronizer is disconnected from its lightwalletd server.
     case synchronizerDisconnected = "ZSYNCO0006"
+    /// The attempt to switch endpoints failed. Check that the hostname and port are correct, and are formatted as <hostname>:<port>.
+    case synchronizerServerSwitch = "ZSYNCO0007"
+    /// The spending key does not belong to the wallet.
+    case synchronizerSpendingKeyDoesNotBelongToTheWallet = "ZSYNCO0008"
 }