(UE4)安卓打包,报 Exception in thread “main“ java.lang.NullPointerException at org.gradle.wrapper..._综合

错误信息

UATHelper: Packaging (Android (ASTC)): Creating rungradle.bat to work around commandline length limit (using unused drive letter Z:)
UATHelper: Packaging (Android (ASTC)): Making .apk with Gradle...
UATHelper: Packaging (Android (ASTC)): Exception in thread "main" java.lang.NullPointerException
UATHelper: Packaging (Android (ASTC)):     at org.gradle.wrapper.BootstrapMainStarter.findLauncherJar(BootstrapMainStarter.java:34)
UATHelper: Packaging (Android (ASTC)):     at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:25)
UATHelper: Packaging (Android (ASTC)):     at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
UATHelper: Packaging (Android (ASTC)):     at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
UATHelper: Packaging (Android (ASTC)): ERROR: C:\WINDOWS\system32\cmd.exe failed with args /c "E:\Photograph\TestAndroid\Intermediate/Android/APK\gradle\rungradle.bat" :app:assembleDebug
UATHelper: Packaging (Android (ASTC)):        (see C:\Users\Administrator\AppData\Roaming\Unreal Engine\AutomationTool\Logs\E+Program+Files+Epic+Games+UE_4.22\Log.txt for full exception trace)
UATHelper: Packaging (Android (ASTC)): AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Android (ASTC)): BUILD FAILE

环境

UE4.22 AndroidSDK环境正常配置;
未安装android studio;
打包使用的gradle版本为4.1.

解决方案
自行下载gradle-4.1-all.zip,删除旧包及解压文件夹,用自己下的包替换并解压;

原因可能为自动下载的gradle包不完整或有其它问题.