在ubunt16.04上调试rk1808 NPU时报错，提示找不到设备

报错时npu_transfer_proxy日志：
# ./npu_transfer_proxy
I NPUTransfer: Starting NPU Transfer Proxy, Transfer version 1.9.7 (95e5c91@2019-08-02T17:50:57), devid = 0123456789ABCDEF, pid = 53833:25873
E NPUTransfer: Create transfer context failed, type:255 currently not supported!
E NPUTransfer: Create client failed!, ret = -1

报错时程序日志：
# ./rknn_ssd
E NPUTransfer: Transfer interface open failed!, ret = -1
E RKNNAPI: rknn_init,  driver open fail!  ret = -1(ERROR_IO)!
rknn_init fail! ret=-3