Android launch failed on ubuntu 16.04

when launch on just ThirdPersonExampleMap
there is an error…

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UATHelper: Packaging (Android (ATC)): :downloader_library:incrementalReleaseJavaCompilationSafeguard
UATHelper: Packaging (Android (ATC)): :downloader_library:compileReleaseJavaWithJavac
UATHelper: Packaging (Android (ATC)): :downloader_library:compileReleaseJavaWithJavac - is not incremental (e.g. outputs have changed, no previous execution, etc.).
UATHelper: Packaging (Android (ATC)): :downloader_library:compileReleaseJavaWithJavac FAILED
UATHelper: Packaging (Android (ATC)): BUILD FAILED
UATHelper: Packaging (Android (ATC)): Total time: 19.823 secs
UATHelper: Packaging (Android (ATC)): ERROR: /bin/sh failed with args -c ‘“/home/vrad/Documents/Unreal Projects/MyProject3/Intermediate/Android/APK/gradle/gradlew” :app:assembleDebug’
UATHelper: Packaging (Android (ATC)): (see /home/vrad/Library/Logs/Unreal Engine/LocalBuildLogs/UAT_Log.txt for full exception trace)
UATHelper: Packaging (Android (ATC)): AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Android (ATC)): RunUAT ERROR: AutomationTool was unable to run successfully.
PackagingResults: Error: Unknown Error

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so i unchecked “enable gradle instead of ant”.
but, another error comes…

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LogPlayLevel: ERROR: /bin/sh failed with args -c ‘“/home/vrad/NVPACK/apache-ant-1.8.2//bin/ant” debug -Djava.source=1.7 -Djava.target=1.7’

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how can i fix it?