MPP error! help please

open file(/boot/toybrick-release) failed
MppDecoderCreate error!

[2020/03/09 14:02:55] D/: destroying RtspClientUnitEM ...
[2020/03/09 14:02:55] D/: destroying RtspClientUnitEM ... done

my code:

#include <rockchip/rockchip_mpp.h>

static MppDecoder *mpp_dec = NULL;
int main(int argc, char **argv){

    mpp_dec = MppDecoderCreate(DECODE_TYPE_H264);
    if (!mpp_dec) {
        std::cout << "MppDecoderCreate error!\n" << std::endl;
        return -1;
    }
}