'ServerAppearanceSystem.AddAppearance(MutableAppearance, bool)': not all code paths return a value

'ServerAppearanceSystem.AddAppearance(MutableAppearance, bool)': not all code paths return a value

Process completed with exit code 1.

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

'Type.IsSerializable' is obsolete: 'Formatter-based serialization is obsolete and should not be used.' (https://aka.ms/dotnet-warnings/SYSLIB0050)

'FieldAttributes.NotSerialized' is obsolete: 'Formatter-based serialization is obsolete and should not be used.' (https://aka.ms/dotnet-warnings/SYSLIB0050)

'Type.IsSerializable' is obsolete: 'Formatter-based serialization is obsolete and should not be used.' (https://aka.ms/dotnet-warnings/SYSLIB0050)

'FormatterServices' is obsolete: 'Formatter-based serialization is obsolete and should not be used.' (https://aka.ms/dotnet-warnings/SYSLIB0050)

Possible null reference argument for parameter 'files' in 'DMPreprocessor? DMCompiler.Preprocess(DMCompiler compiler, List<string> files, Dictionary<string, string>? macroDefines)'.

Converting null literal or possible null value to non-nullable type.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'interfaceFile' in 'string DMCompiler.SaveJson(List<DreamMapJson> maps, string interfaceFile, string outputFile)'.

Non-nullable field 'VarName' must contain a non-null value when exiting constructor. Consider declaring the field as nullable.