# EvaluationException class

Namespace: [Grasshopper2.Expressions](https://developer.rhino3d.com/api/gh2/namespace/grasshopper2.expressions.md) · Assembly: [Grasshopper2](https://developer.rhino3d.com/api/gh2/assembly/grasshopper2.md)

```cs
public sealed class EvaluationException : Exception
```

Exception used during evaluation of an expression.

## Constructors

- [EvaluationException](https://developer.rhino3d.com/api/gh2/type/grasshopper2.expressions.evaluationexception/ctor.md): Create a new expression compilation exception.