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    ///! RPC Error codes and error objects

    mod codes {
    	// NOTE [ToDr] Codes from [-32099, -32000]
    	pub const UNKNOWN: i64 = -32000;
    	pub const EXECUTION_ERROR: i64 = -32015;
    	pub const TRANSACTION_NOT_FOUND: i64 = -32096;
    	pub const TRANSACTION_OUTPUT_NOT_FOUND: i64 = -32097;
    	pub const TRANSACTION_OF_SIDE_BRANCH: i64 = -32098;
    	pub const BLOCK_NOT_FOUND: i64 = -32099;
    	pub const NODE_ALREADY_ADDED: i64 = -32150;
    	pub const NODE_NOT_ADDED: i64 = -32151;
    }

    use std::fmt;
    use jsonrpc_core::{Error, ErrorCode, Value};

    macro_rules! rpc_unimplemented {
    	() => (Err(::v1::helpers::errors::unimplemented(None)))
    }

    pub fn unimplemented(details: Option<String>) -> Error {
    	Error {
    		code: ErrorCode::InternalError,
    		message: "This request is not implemented yet. Please create an issue on Github repo.".into(),
    		data: details.map(Value::String),
    	}
    }

    pub fn invalid_params<T: fmt::Debug>(param: &str, details: T) -> Error {
    	Error {
    		code: ErrorCode::InvalidParams,
    		message: format!("Couldn't parse parameters: {}", param),
    		data: Some(Value::String(format!("{:?}", details))),
    	}
    }

    pub fn execution<T: fmt::Debug>(data: T) -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::EXECUTION_ERROR),
    		message: "Execution error.".into(),
    		data: Some(Value::String(format!("{:?}", data))),
    	}
    }

    pub fn block_not_found<T: fmt::Debug>(data: T) -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::BLOCK_NOT_FOUND),
    		message: "Block with given hash is not found".into(),
    		data: Some(Value::String(format!("{:?}", data))),
    	}
    }

    pub fn block_at_height_not_found<T: fmt::Debug>(data: T) -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::BLOCK_NOT_FOUND),
    		message: "Block at given height is not found".into(),
    		data: Some(Value::String(format!("{:?}", data))),
    	}
    }

    pub fn transaction_not_found<T: fmt::Debug>(data: T) -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::TRANSACTION_NOT_FOUND),
    		message: "Transaction with given hash is not found".into(),
    		data: Some(Value::String(format!("{:?}", data))),
    	}
    }

    pub fn transaction_output_not_found<T: fmt::Debug>(data: T) -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::TRANSACTION_OUTPUT_NOT_FOUND),
    		message: "Transaction output is not found".into(),
    		data: Some(Value::String(format!("{:?}", data))),
    	}
    }

    pub fn transaction_of_side_branch<T: fmt::Debug>(data: T) -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::TRANSACTION_OF_SIDE_BRANCH),
    		message: "Transaction is of side branch".into(),
    		data: Some(Value::String(format!("{:?}", data))),
    	}
    }

    pub fn node_already_added() -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::NODE_ALREADY_ADDED),
    		message: "Node already added to the node table".into(),
    		data: None,
    	}
    }

    pub fn node_not_added() -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::NODE_NOT_ADDED),
    		message: "Node not added to the node table".into(),
    		data: None,
    	}
    }

    pub fn unknown() -> Error {
    	Error {
    		code: ErrorCode::ServerError(codes::UNKNOWN),
    		message: "Unknown error has occurred".into(),
    		data: None,
    	}
    }

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