rknn_api里的demo在build时报错librknn_api.so: 无法添加符号

想跑一个api   rknn_mobilenet_demo

cmake后make提示../../../librknn_api/lib64/librknn_api.so: 无法添加符号: 文件格式错误

CMakeFiles/rknn_mobilenet_demo.dir/build.make:111: recipe for target 'rknn_mobilenet_demo' failed
make[2]: *** [rknn_mobilenet_demo] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/rknn_mobilenet_demo.dir/all' failed
make[1]: *** [CMakeFiles/rknn_mobilenet_demo.dir/all] Error 2
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2


整个文件夹是RV1126_1109_20210616.tgz解压得到的
位于解压后文件的./external/rknpu/rknn/rknn_api/examples/rknn_mobilenet_demo下