I just successfully built fishies with version 2020.3574 too. You should try a different sample and if that works, check your other code because there may a problem. You can compare your files (config.lua, build.settings, …) to the fishies example.
10:17:09.972 Copyright (C) 2009-2020 C o r o n a L a b s I n c . 10:17:09.972 Version: 3.0.0 10:17:09.972 Build: 2020.3574 10:17:09.982 Platform: GenericAndroidDevice / x64 / 10.0 / GeForce GTX 970/PCIe/SSE2 / 4.6.0 NVIDIA 436.30 / 2020.3574 / en\_US | US | en\_US | en 10:17:09.982 Loading project from: C:\Program Files (x86)\Corona Labs\Corona\Sample Code\Graphics\Fishies 10:17:09.982 Project sandbox folder: C:\Users\emaur\AppData\Local\Corona Labs\Corona Simulator\Sandbox\fishies-F32DCB45A2EA6755593C7FF39278090E\Documents 10:17:19.955 Using custom build id from app bundle: 00000 (AppSettings.lua) 10:17:19.955 10:17:19.955 Using custom Build Id 00000 10:17:19.955 HTML5 builder started 10:17:22.979 .data file map (size/name) 10:17:22.979 Size = 265, /AndroidResources/res/mipmap-anydpi-v26/ic\_launcher.xml 10:17:22.979 Size = 1564, /AndroidResources/res/mipmap-hdpi/ic\_launcher.png 10:17:22.979 Size = 1366, /AndroidResources/res/mipmap-hdpi/ic\_launcher\_foreground.png 10:17:22.979 Size = 1127, /AndroidResources/res/mipmap-mdpi/ic\_launcher.png 10:17:22.979 Size = 990, /AndroidResources/res/mipmap-mdpi/ic\_launcher\_foreground.png 10:17:22.979 Size = 2272, /AndroidResources/res/mipmap-xhdpi/ic\_launcher.png 10:17:22.979 Size = 1850, /AndroidResources/res/mipmap-xhdpi/ic\_launcher\_foreground.png 10:17:22.979 Size = 3439, /AndroidResources/res/mipmap-xxhdpi/ic\_launcher.png 10:17:22.979 Size = 2934, /AndroidResources/res/mipmap-xxhdpi/ic\_launcher\_foreground.png 10:17:22.979 Size = 5022, /AndroidResources/res/mipmap-xxxhdpi/ic\_launcher.png 10:17:22.979 Size = 4027, /AndroidResources/res/mipmap-xxxhdpi/ic\_launcher\_foreground.png 10:17:22.979 Size = 121, /AndroidResources/res/values/values.xml 10:17:22.979 Size = 134321, /aquariumbackgroundIPhone.jpg 10:17:22.979 Size = 132004, /aquariumbackgroundIPhoneLandscape.jpg 10:17:22.979 Size = 32990, /bubble\_strong\_wav.wav 10:17:22.979 Size = 577, /build.settings 10:17:22.979 Size = 6093, /fish.small.blue.png 10:17:22.979 Size = 5925, /fish.small.red.png 10:17:22.979 Size = 1474, /Icon.png 10:17:22.979 Size = 1936, /Images.xcassets/AppIcon.appiconset/Contents.json 10:17:22.979 Size = 14682, /Images.xcassets/AppIcon.appiconset/Icon-1024.png 10:17:22.979 Size = 4205, /Images.xcassets/AppIcon.appiconset/Icon-120.png 10:17:22.979 Size = 4889, /Images.xcassets/AppIcon.appiconset/Icon-152.png 10:17:22.979 Size = 5371, /Images.xcassets/AppIcon.appiconset/Icon-167.png 10:17:22.979 Size = 4898, /Images.xcassets/AppIcon.appiconset/Icon-180.png 10:17:22.979 Size = 1137, /Images.xcassets/AppIcon.appiconset/Icon-40.png 10:17:22.979 Size = 1817, /Images.xcassets/AppIcon.appiconset/Icon-58.png 10:17:22.979 Size = 2520, /Images.xcassets/AppIcon.appiconset/Icon-76.png 10:17:22.979 Size = 2606, /Images.xcassets/AppIcon.appiconset/Icon-80.png 10:17:22.979 Size = 6252, /Images.xcassets/AppIcon.appiconset/Icon-87.png 10:17:22.979 Size = 62, /Images.xcassets/Contents.json 10:17:22.979 Size = 1792, /LaunchScreen.storyboardc/01J-lp-oVM-view-Ze5-6b-2t3.nib 10:17:22.979 Size = 1872, /LaunchScreen.storyboardc/designable.storyboard 10:17:22.979 Size = 258, /LaunchScreen.storyboardc/Info.plist 10:17:22.979 Size = 832, /LaunchScreen.storyboardc/UIViewController-01J-lp-oVM.nib 10:17:22.979 Size = 283, /ReadMe.txt 10:17:22.979 Size = 3988, /resource.car 10:17:22.979 Size = 50131, /widget\_theme\_android.png 10:17:22.979 Size = 118927, /widget\_theme\_android@2x.png 10:17:22.979 Size = 19552, /widget\_theme\_android\_holo\_dark.png 10:17:22.979 Size = 44161, /widget\_theme\_android\_holo\_dark@2x.png 10:17:22.979 Size = 82090, /widget\_theme\_android\_holo\_dark@4x.png 10:17:22.979 Size = 20161, /widget\_theme\_android\_holo\_light.png 10:17:22.979 Size = 44277, /widget\_theme\_android\_holo\_light@2x.png 10:17:22.979 Size = 82343, /widget\_theme\_android\_holo\_light@4x.png 10:17:22.979 Size = 53098, /widget\_theme\_ios.png 10:17:22.979 Size = 16476, /widget\_theme\_ios7.png 10:17:22.979 Size = 45783, /widget\_theme\_ios7@2x.png 10:17:22.979 Size = 148641, /widget\_theme\_ios7@4x.png 10:17:22.979 Size = 123632, /widget\_theme\_ios@2x.png 10:17:22.979 Size = 1109, /widget\_theme\_onOff\_mask.png 10:17:22.979 Size = 166, /widget\_theme\_onOff\_mask\_android\_holo.png 10:17:22.979 Size = 1420, /widget\_theme\_pickerWheel\_mask.png 10:17:22.979 Total data file size = 1249728 = 1220KB = 1MB 10:17:23.574 HTML5 builder ended