我是Ionic的新手，试图创建一个示例应用。在这里，我尝试使用 angular-material 。因此，我将角度素材文件下载到 www / lib / angular-material 文件夹中。它在浏览器中工作正常，但是当我尝试生成apk BUILD FAILED时。得到此错误
BUILD FAILED
Total time: 46.514 secs
Error: cmd: Command failed with exit code 1 Error output:
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':packageDebug'.
> java.io.FileNotFoundException: D:\Android\myApp\platforms\android\build\intermediates\assets\debug\www\lib\angular-material (Access is denied)
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
帮我解决这个问题。