我已按照此处的构建说明进行操作：
https://boofcv.org/index.php?title=Tutorial_Camera_Calibration
并得到这个奇怪的错误信息：
C:\boofcv\applications>gradle applicationsJar
Skipping integration/android because ANDROID_HOME has not been set! See integration/android/readme.txt
Skipping integration/boofcv-openkinect because boofcv-openkinect/libfreenect is missing! See integration/openkinect/readme.txt
Parallel execution is an incubating feature.
FAILURE: Build failed with an exception.
* What went wrong:
Failed to capture snapshot of input files for task ':applications:applicationsJar' property 'rootSpec$1$1$2$1' during up-to-date check.
> A Jar can only accept a file or directory that exists: C:\boofcv\applications\build\osgi-classes
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
* Get more help at https://help.gradle.org
BUILD FAILED in 10s
38 actionable tasks: 10 executed, 28 up-to-date
我的 boofcv 版本是 0.27。