I am also facing the same issue with XCode12 + iOS14, a quick fix is remove batch size (request.fetchBatchSize = 0) will fix this issue but this will impact performance of the app.
if I create build using Xcode 11.5 and run in iOS 14 app works fine without any issues but when use XCode12 getting this issue
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I am also getting same issue, I can't disable bitcode as it is an mandate for me,
error logs -
{
code = 1061;
description = "ipatool failed with an exception: #<CmdSpec::NonZeroExitException: $ /Applications/Xcode12.0.app/Contents/Developer/usr/bin/python3 /Applications/Xcode12.0.app/Contents/Developer/usr/bin/bitcode-build-tool -v -t /Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/AFNetworkActivityLogger.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/AFNetworking.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/MagicalRecord.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/NUI.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/NUIParse.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/PromiseKit.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/Reachability.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/SAMKeychain.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks/Tweaks.framework -L /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/Frameworks --sdk /Applications/Xcode12.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.0.sdk -o /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/MyTestApp --generate-dsym /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-out/arm64/Payload/MyTestApp.app/MyTestApp.dSYM --strip-swift-symbols /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-in/arm64/Payload/MyTestApp.app/MyTestApp\nStatus: pid 24989 exit 1\nStdout:\n SDK path: /Applications/Xcode12.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.0.sdk\n SDK version: 14.0\n PATH: ['/Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin', '/Applications/Xcode12.0.app/Contents/Developer/usr/bin']\n Using: /Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/lipo\n MachoInfo: cd /\n ['/Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/lipo', '-info', '/var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-in/arm64/Payload/MyTestApp.app/MyTestApp']\n -= Output =-\n Non-fat file: /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-in/arm64/Payload/MyTestApp.app/MyTestApp is architecture: arm64\n Exited with 0\n \n Command took 0 seconds\n Using: /Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/dwarfdump\n GetUUID: cd /\n ['/Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/dwarfdump', '-u', '/var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-in/arm64/Payload/MyTestApp.app/MyTestApp']\n -= Output =-\n UUID: 3F3E2EFA-8272-3259-BADC-18F8200552EF (arm64) /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-in/arm64/Payload/MyTestApp.app/MyTestApp\n Exited with 0\n \n Command took 0 seconds\n Using: /Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/segedit\n ExtractXAR: cd /\n ['/Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/segedit', '/var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/ipatool20201012-17914-kc2g4k/thinned-in/arm64/Payload/MyTestApp.app/MyTestApp', '-extract', 'LLVM', 'bundle', '/var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/MyTestAppaj1v9dpt/MyTestApp.arm64.xar']\n -= Output =-\n Exited with 0\n \n Command took 0 seconds\n Bitcode bundle version: 1.0\n Setting platform to: iOS\n Using: /Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld\n Using: /Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang\n Using: /Applications/Xcode12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc\n Clang: cd /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/tempiktd6ck2\n ['/Applications/Xcode_12.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang', '-cc1', '-triple', 'arm64-apple-ios10.0.0', '-emit-obj', '-disable-llvm-passes', '-faligned-alloc-unavailable', '-target-sdk-version=14.0', '-target-abi', 'darwinpcs', '-O0', '-x', 'ir', '0001', '-o', '0001.o']\n -= Output =-\n Exited with 0\n \n Command took 0 seconds\n Clang: cd /var/folders/mk/swmr9l0934vct6yv0xfvykgwkb7kl1/T/tempiktd6ck2\n
Any update on this, I am struggling on this
[Error Log - ipatool failed with an exception: #]
facing same issue find the Error Log - https://developer.apple.com/forums/content/attachment/e2c047f2-56ce-4008-a378-fec7ab3d7e2b