NNIE_MAPPER_13报错，ERROR: func: DataNormalization

Hi3520DV500
SVP: /HiSVP_PC_V1.3.1.4
opencv: open-4.2.0
protobuf: 3.9.0

运行命令:nnie_mapper_13 classification/alexnet/alexnet_no_group_func.cfg

得到如下的报错信息
`Mapper Version 1.3.1.4_B010 (NNIE_1.3) 210426013dd092
begin net parsing….
end net parsing
begin prev optimizing….
end prev optimizing….
begin net quantalizing(CPU)….

ERROR: func: DataNormalization line: 263
image file ./../data/classification/imagenet/ref/ILSVRC2012_val_00000001.JPEG decode ERROR, or file path is invalid,please check file path exist and encoding charset is utf8(Linux) or ansi(Windows)!`