> For the complete documentation index, see [llms.txt](https://docs.yarnspinner.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yarnspinner.dev/2.4/api/csharp/yarn.compiler/yarn.compiler.diagnostic/yarn.compiler.diagnostic..ctor-4.md).

# Diagnostic(string,Range,string,DiagnosticSeverity)

Constructor in [Diagnostic](/2.4/api/csharp/yarn.compiler/yarn.compiler.diagnostic.md)

## Summary

Initializes a new instance of the [Diagnostic](/2.4/api/csharp/yarn.compiler/yarn.compiler.diagnostic.md) class.

```csharp
public Diagnostic(string fileName, Range range, string message, DiagnosticSeverity severity = DiagnosticSeverity.Error)
```

## Parameters

| Name                                                                                                                                                          | Description                                                                                                                                                                         |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `string` fileName                                                                                                                                             | Gets or sets the path, URI or file-name that the issue occurred in.                                                                                                                 |
| [Yarn.Compiler.Range](/2.4/api/csharp/yarn.compiler/yarn.compiler.range.md) range                                                                             | Gets or sets the range of the file indicated by [FileName](/2.4/api/csharp/yarn.compiler/yarn.compiler.diagnostic/yarn.compiler.diagnostic.filename.md) that the issue occurred in. |
| `string` message                                                                                                                                              | Gets or sets the description of the issue.                                                                                                                                          |
| [Yarn.Compiler.Diagnostic.DiagnosticSeverity](/2.4/api/csharp/yarn.compiler/yarn.compiler.diagnostic/yarn.compiler.diagnostic.diagnosticseverity.md) severity | Gets or sets the severity of the issue.                                                                                                                                             |