[问答]编译报错

在Linux环境下编译时 报如下错误，

=== start build ===

ERROR Unresolved dependencies.
//applications/sample/wifi-iot/app:app(//build/lite/toolchain:linux_x86_64_riscv32_gcc)
  needs //applications/sample/wifi-iot/app/gpio_demo:gpio_demo(//build/lite/toolchain:linux_x86_64_riscv32_gcc)

you can check build log in /home/harmony/harmony/code/code/out/wifiiot/build.log
/home/harmony/gn/gn gen /home/harmony/harmony/code/code/out/wifiiot --root=. --dotfile=build/lite/.gn --args='product = "wifiiot" ohos_build_type = "release"' failed, return code is 1
usage:
  python build.py ipcamera_hi3516dv300
  python build.py ipcamera_hi3518ev300
  python build.py wifiiot

positional arguments:
  product               Name of the product

optional arguments:
  -h, --help            show this help message and exit
  -b BUILD_TYPE, --build_type BUILD_TYPE
                        release or debug version.
  -t [TEST [TEST ...]], --test [TEST [TEST ...]]
                        Compile test suit
  -n, --ndk             Compile ndk

这是什么意思呀，该怎么这是什么意思呀，该怎么解决