ionic打包报错Execution failed for task ':compileDebugJavaWithJavac'.

添加ionic插件cordova-plugin-file可能会遇到如下报错

• 提示信息

:processDebugResources
:generateDebugSources
:compileDebugJava
apache/cordova/filetransfer/FileTransfer.java:59: error: package org.apache.cordova.file does not exist
import org.apache.cordova.file.FileUtils;
                              ^
apache/cordova/filetransfer/FileTransfer.java:912: error: cannot find symbol
                        FileUtils filePlugin = (FileUtils) pm.getPlugin("File");
                        ^
  symbol: class FileUtils
cordova/filetransfer/FileTransfer.java:912: error: cannot find symbol
                        FileUtils filePlugin = (FileUtils) pm.getPlugin("File");

 :compileDebugJavaWithJavac FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileDebugJavaWithJavac'.

> Compilation failed; see the compiler error output for details.

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debugoption to get more log output.

BUILD FAILED

Total time: 6 mins 51.314 secs                       

如果你在ionic cordova platform add android时，有注意到cordova-plugin-file是需要cordova-android版本大于等于6.3.0

• 解决方案

所以只需要运行命令
ionic cordova platform remove android
ionic cordova platform add android@6.3.0
这样就在运行ionic build就能打包成功了