Build error MT0057 for .Net Maui iOS, Mac Catalyst builds with no problem

Question

I can build and run for Mac Catalyst fine with this command

dotnet build -t:Run -f net6.0-maccatalyst MyApp.csproj

but when I try to build for iOS using this command

dotnet build -t:Run -f net6.0-ios -p:_DeviceName=:v2:udid=********-************** MyApp.csproj

I get this error

EXEC : error MT0057: Cannot determine the path to Xcode.app from the sdk root '/Library/Developer/CommandLineTools'. Please specify the full path to the Xcode.app bundle. [/Users/chris/Documents/Development/MyApp/src/MyApp/MyApp.csproj]
`/usr/local/share/dotnet/sdk/6.0.201/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.Sdk.targets(897,5): error MSB3073: The command "/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk/15.2.302-preview.14.122/tools/bin/mlaunch --launchsim bin/Debug/net6.0-ios/iossimulator-x64/MyApp.app/ --device :v2:udid=********-************ --stdout /dev/ttys000 --stderr /dev/ttys000 --wait-for-exit" exited with code 1. [/Users/chris/Documents/Development/MyApp/src/MyApp/MyApp.csproj]

It is odd that it can find XCode for Catalyst but cannot find it for iOS. Any help would be appreciated.

Answer 1

Hi @Chris Gonzales ,

It prompts that there is something wrong with the path /Library/Developer/CommandLineTools, please open Xcode and check Xcode > Preferences > Locations > Command Line Tools.
/usr/local/share/dotnet/packs/Microsoft.iOS.Sdk/15.2.302-preview.14.122/tools/bin/mlaunch, the preview version is a little old, you could upgrade to the latest MAUI RC. The 15.2.302-preview.14.122 version on my side works fine, you could have a try.

My Testing :

1. Update : dotnet workload update
2. Create a MAUI project : sudo dotnet new maui -n 'HelloMAUI'
3. Build for iOS( cd to the project path, udid is the id of my simulator ) : dotnet build -t:Run -f net6.0-ios -p:_DeviceName=:v2:udid=********-************** HelloMAUI.csproj

Note: my Command Line Tools location is /Applications/Xcode.app

Best Regards,
Wenyan Zhang

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