The name '_chats' does not exist in the current context

The name '_chats' does not exist in the current context

Process completed with exit code 1.

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

Possible null reference argument for parameter 'jsonTypeInfo' in 'string JsonSerializer.Serialize<T>(T value, JsonTypeInfo<T> jsonTypeInfo)'.

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

Possible null reference argument for parameter 'jsonTypeInfo' in 'T? JsonSerializer.Deserialize<T?>(string json, JsonTypeInfo<T?> jsonTypeInfo)'.

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

Possible null reference argument for parameter 'jsonTypeInfo' in 'string JsonSerializer.Serialize<T>(T value, JsonTypeInfo<T> jsonTypeInfo)'.

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

Possible null reference argument for parameter 'jsonTypeInfo' in 'T? JsonSerializer.Deserialize<T?>(string json, JsonTypeInfo<T?> jsonTypeInfo)'.

The constructor on type 'ChatGPT.ViewModels.Layouts.LayoutViewModel' has been annotated with JsonConstructorAttribute but is not accessible by the source generator. (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnostics/syslib1222)