Fix "Error()" function. #588

Job	Run time
windows-msvc-shared (CAPNPROTO)	7m 59s
windows-msvc-shared (TOML)	4m 26s
windows-msvc-shared (MSGPACK)	3m 53s
windows-msvc-shared (CBOR)	7m 48s
windows-msvc-shared (AVRO)	8m 22s
windows-msvc-shared (UBJSON)	7m 57s
windows-msvc-shared (YAML)	11m 20s
windows-msvc-shared (JSON)	11m 42s
windows-msvc-shared (PARQUET)	40m 33s
windows-msvc-shared (FLEXBUFFERS)	5m 41s
windows-msvc-shared (XML)	4m 7s
windows-msvc (FLEXBUFFERS)	6m 13s
windows-msvc (AVRO)	7m 29s
windows-msvc (MSGPACK)	3m 56s
windows-msvc (benchmarks)	50m 22s
windows-msvc (CAPNPROTO)	8m 0s
windows-msvc (JSON)	11m 19s
windows-msvc (YAML)	4m 52s
windows-msvc (XML)	4m 36s
windows-msvc (CBOR)	9m 45s
windows-msvc (PARQUET)	43m 8s
windows-msvc (UBJSON)	8m 12s
windows-msvc (TOML)	4m 40s
	4h 36m 20s

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