内容简介：偶然在StackOverFlow看到一个奇葩问题，下面有一个回答：所以就解决了呀，不要用软链接打开就行了，Gradle不支持软链接文件夹。无语
错误信息
Argument for @NotNull parameter 'message' of com/android/tools/idea/gradle/project/sync/GradleSyncState.syncFailed must not be null java.lang.IllegalArgumentException: Argument for @NotNull parameter 'message' of com/android/tools/idea/gradle/project/sync/GradleSyncState.syncFailed must not be null at com.android.tools.idea.gradle.project.sync.GradleSyncState.$$$reportNull$$$0(GradleSyncState.java) at com.android.tools.idea.gradle.project.sync.GradleSyncState.syncFailed(GradleSyncState.java) at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.doPopulateProject(IdeaSyncPopulateProjectTask.java:135) at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.populate(IdeaSyncPopulateProjectTask.java:97) at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask.access$000(IdeaSyncPopulateProjectTask.java:39) at com.android.tools.idea.gradle.project.sync.idea.IdeaSyncPopulateProjectTask$1.run(IdeaSyncPopulateProjectTask.java:86) at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:750) at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$1(CoreProgressManager.java:157) at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:580) at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:525) at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:85) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:144) at com.intellij.openapi.progress.impl.CoreProgressManager$4.run(CoreProgressManager.java:395) at com.intellij.openapi.application.impl.ApplicationImpl$1.run(ApplicationImpl.java:305) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745)
情境
之前这几个android项目是在windows上编写的，切换到 linux 环境之后继续做开发。
我把这个分区挂载到/media/user/data 之后，为了方便使用，创建了一个软链接
/home/user/data/
打开项目是从这个软链接打开的，结果每次都build不了，我还以为我电脑出了什么问题，Google无果。
偶然在StackOverFlow看到一个奇葩问题， # [Android Studio build error on NTFS partition](https://stackoverflow.com/questions/52721989/android-studio-build-error-on-ntfs-partition)
I’m having problems building apps on Android Studio. Things work fine when the project is on my ext4 partition, but when I created a new one on my NTFS, I encountered this: The error disappeared when I restarted Android Studio, but after that I still cannot run my app (the project structure in the sidebar is not displayed properly). I’m using Android Studio 3.2 on Ubuntu 18.04.1.
下面有一个回答：
I figured it out. (By mistake, to be honest…) Let’s say you have an NTFS partition mount at /mnt/ntfs, and your project is at /mnt/ntfs/projects/project. Your home partition (ext4) is mounted at /home, your home directory is /home/user and you have a symbolic link at /home/user/projects that points to /mnt/ntfs/projects. The reason I (and hopefully you too) have encountered this error is that when using Android Studio’s “Open Project…” option, I provided the symbolic link (/home/user/projects/project). When trying to provide the real path (/mnt/ntfs/projects/project) the gradle sync succeeded. So to fix this for now, simply provide the real path. However, this should probably be addressed by IntelliJ or the developers of Gradle.
解决
所以就解决了呀，不要用软链接打开就行了，Gradle不支持软链接文件夹。无语
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