Constant zebra_rpc::constants::INVALID_PARAMETERS_ERROR_CODE

pub const INVALID_PARAMETERS_ERROR_CODE: ErrorCode;

The RPC error code used by zcashd for incorrect RPC parameters.

[jsonrpc_core] uses these codes: https://github.com/paritytech/jsonrpc/blob/609d7a6cc160742d035510fa89fb424ccf077660/core/src/types/error.rs#L25-L36

node-stratum-pool mining pool library expects error code -1 to detect available RPC methods: https://github.com/s-nomp/node-stratum-pool/blob/d86ae73f8ff968d9355bb61aac05e0ebef36ccb5/lib/pool.js#L459