The type or namespace name 'ApplicationSettingsBase' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'SettingsProviderAttribute' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'SettingsProvider' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'ApplicationSettingsBase' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'SettingsProviderAttribute' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'SettingsProvider' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'ApplicationSettingsBase' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'SettingsProviderAttribute' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'SettingsProvider' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'ApplicationSettingsBase' could not be found (are you missing a using directive or an assembly reference?)

'ReliabilityContractAttribute' is obsolete: 'The Constrained Execution Region (CER) feature is not supported.' (https://aka.ms/dotnet-warnings/SYSLIB0004)

'Consistency' is obsolete: 'The Constrained Execution Region (CER) feature is not supported.' (https://aka.ms/dotnet-warnings/SYSLIB0004)

'Cer' is obsolete: 'The Constrained Execution Region (CER) feature is not supported.' (https://aka.ms/dotnet-warnings/SYSLIB0004)

Nullability of reference types in type of parameter 'obj' of 'int Profile.CompareTo(object obj)' doesn't match implicitly implemented member 'int IComparable.CompareTo(object? obj)' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.