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can't build android app

hi there! since the update to 4.18 (and android sdk update to api-27) i can't build for older engine version. 4.18 is working but can't build using 4.17 and 4.15. i get the following error :

 LogPlayLevel: ====11/5/2017 5:55:58 PM====UPDATING BUILD CONFIGURATION FILES====================================================
 LogPlayLevel: **************************************************************************
 LogPlayLevel: The "android" command is deprecated.
 LogPlayLevel: For manual SDK, AVD, and project management, please use Android Studio.
 LogPlayLevel: For command-line tools, use tools\bin\sdkmanager.bat
 LogPlayLevel: and tools\bin\avdmanager.bat
 LogPlayLevel: **************************************************************************
 LogPlayLevel: Invalid or unsupported command "--silent update lib-project --path JavaLibs/downloader_library --target android-23"
 LogPlayLevel: Supported commands are:
 LogPlayLevel: android list target
 LogPlayLevel: android list avd
 LogPlayLevel: android list device
 LogPlayLevel: android create avd
 LogPlayLevel: android move avd
 LogPlayLevel: android delete avd
 LogPlayLevel: android list sdk
 LogPlayLevel: android update sdk
 LogPlayLevel: Program.Main: ERROR: AutomationTool terminated with exception: ERROR: C:/NVPACK2/android-sdk-windows/tools/android.bat failed with args --silent update lib-project --path JavaLibs/downloader_library --target android-23
 LogPlayLevel: Program.Main: AutomationTool exiting with ExitCode=1 (Error_Unknown)
 LogPlayLevel: Completed Launch On Stage: Deploy Task, Time: 4.504829
 PackagingResults:Error: Error Launch failed! Unknown Error

i tried different API versions but it still doesn't work . thanks in advance !

Product Version: UE 4.15
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asked Nov 05 '17 at 05:00 PM in Packaging & Deployment

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