Constant zebra_rpc::constants::MISSING_BLOCK_ERROR_CODE

pub const MISSING_BLOCK_ERROR_CODE: ErrorCode;

The RPC error code used by zcashd for missing blocks.

lightwalletd expects error code -8 when a block is not found: https://github.com/zcash/lightwalletd/blob/v0.4.16/common/common.go#L287-L290