我是 flutter 和 android studio 的初学者，当我试图运行一个非常基本的 hello world 程序时，我得到了这个：
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:packageDebug'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
> java.io.FileNotFoundException: D:\flutter\newapp\build\app\intermediates\signing_config\debug\out\signing-config.json (Access is denied)
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 16s
[!] Gradle threw an …我正在创建一个关于颤振的基本短信应用程序。目前只按空格键 n 次并按发送会导致带有 n 个空格的文本气泡。我如何告诉颤振应该将空格视为空或不应发送？