# Assembly compilation errors

> **Exception**: UiPath.ActivityCompiler.Exceptions.NameDoesNotExistCSharpCompilationException

## NameDoesNotExistCSharpCompilationException

**Exception**: UiPath.ActivityCompiler.Exceptions.NameDoesNotExistCSharpCompilationException

**Problem**: You may encounter this exception when your Studio project, which includes coded automations (CS files), has a name containing expressions that are not supported. Common unsupported expressions include: `Testing`, `System`, `Portable`, `SAP`, `UiPath`, `Driver`, or other activity package names.

**Solution**: To remedy this issue, you can modify your project name to exclude unsupported expressions. If you want to keep the desired expression, consider separating these expressions with underscores. For example, if your project name is `My SAP Project` (which includes `SAP`, an unsupported expression), consider using underscores to separate the words, making it `My_SAP_Project`.