diff --git a/substrate/client/rpc-api/src/author/error.rs b/substrate/client/rpc-api/src/author/error.rs
index eee77edd5e..fe12bd581f 100644
--- a/substrate/client/rpc-api/src/author/error.rs
+++ b/substrate/client/rpc-api/src/author/error.rs
@@ -43,15 +43,9 @@ pub enum Error {
 	/// Incorrect extrinsic format.
 	#[error("Invalid extrinsic format: {}", .0)]
 	BadFormat(#[from] codec::Error),
-	/// Incorrect seed phrase.
-	#[error("Invalid seed phrase/SURI")]
-	BadSeedPhrase,
 	/// Key type ID has an unknown format.
 	#[error("Invalid key type ID format (should be of length four)")]
 	BadKeyType,
-	/// Key type ID has some unsupported crypto.
-	#[error("The crypto of key type ID is unknown")]
-	UnsupportedKeyType,
 	/// Some random issue with the key store. Shouldn't happen.
 	#[error("The key store is unavailable")]
 	KeyStoreUnavailable,
@@ -84,8 +78,6 @@ const POOL_TOO_LOW_PRIORITY: i64 = POOL_INVALID_TX + 4;
 const POOL_CYCLE_DETECTED: i64 = POOL_INVALID_TX + 5;
 /// The transaction was not included to the pool because of the limits.
 const POOL_IMMEDIATELY_DROPPED: i64 = POOL_INVALID_TX + 6;
-/// The key type crypto is not known.
-const UNSUPPORTED_KEY_TYPE: i64 = POOL_INVALID_TX + 7;
 /// The transaction was not included to the pool since it is unactionable,
 /// it is not propagable and the local node does not author blocks.
 const POOL_UNACTIONABLE: i64 = POOL_INVALID_TX + 8;
@@ -156,14 +148,6 @@ impl From<Error> for rpc::Error {
 					 the local node does not author blocks".into(),
 				),
 			},
-			Error::UnsupportedKeyType => rpc::Error {
-				code: rpc::ErrorCode::ServerError(UNSUPPORTED_KEY_TYPE),
-				message: "Unknown key type crypto" .into(),
-				data: Some(
-					"The crypto for the given key type is unknown, please add the public key to the \
-					request to insert the key successfully.".into()
-				),
-			},
 			Error::UnsafeRpcCalled(e) => e.into(),
 			e => errors::internal(e),
 		}