我下载了 ubuntu-filemanager-app 并在 UbuntuSDK 中打开了该项目并想在 Emulator 中运行它，但是出现此错误：
23:49:37: Running steps for project ubuntu-filemanager-app...
23:49:37: Starting: "/home/roman/.config/ubuntu-sdk/ubuntu-sdk-15.04-armhf/make"
make: *** No targets specified and no makefile found. Stop.
Command returned 2: schroot -c click-ubuntu-sdk-15.04-armhf-b7ba706d-013d-4a9d-9c5e-ff5a75748094 --run-session -- env DEB_HOST_ARCH_ENDIAN=little DEB_TARGET_ARCH_BITS=32 DEB_TARGET_GNU_CPU=arm DEB_TARGET_GNU_SYSTEM=linux-gnueabihf DEB_HOST_MULTIARCH=arm-linux-gnueabihf DEB_HOST_GNU_CPU=arm DEB_BUILD_GNU_SYSTEM=linux-gnu DEB_HOST_GNU_TYPE=arm-linux-gnueabihf DEB_BUILD_ARCH_ENDIAN=little DEB_HOST_ARCH=armhf DEB_TARGET_GNU_TYPE=arm-linux-gnueabihf DEB_BUILD_MULTIARCH=x86_64-linux-gnu DEB_HOST_ARCH_OS=linux DEB_BUILD_ARCH=amd64 DEB_BUILD_GNU_CPU=x86_64 DEB_TARGET_ARCH=armhf DEB_TARGET_ARCH_ENDIAN=little DEB_TARGET_MULTIARCH=arm-linux-gnueabihf DEB_HOST_ARCH_CPU=arm DEB_BUILD_GNU_TYPE=x86_64-linux-gnu DEB_BUILD_ARCH_OS=linux DEB_BUILD_ARCH_BITS=64 DEB_TARGET_ARCH_OS=linux DEB_BUILD_ARCH_CPU=amd64 DEB_HOST_GNU_SYSTEM=linux-gnueabihf DEB_TARGET_ARCH_CPU=arm DEB_HOST_ARCH_BITS=32 make
23:49:38: The process "/home/roman/.config/ubuntu-sdk/ubuntu-sdk-15.04-armhf/make" exited with code 2.
Error while building/deploying project ubuntu-filemanager-app (kit: UbuntuSDK for armhf (GCC ubuntu-sdk-15.04-vivid))
When executing step 'Ubuntu SDK Make'
23:49:38: Elapsed time: 00:01.