# UnexpectedTokenException Class

> Is thrown when calling the method MailMerge.MergeJsonData with a JSON string containing an unexpected character.

- **Product:** TX Text Control .NET Server
- **Section:** Reference
- **Kind:** Class
- **Introduced:** 24.0
- **Namespace:** `TXTextControl.DocumentServer.Json`
- **Package:** `TXTextControl.TextControl.Core.SDK` (assembly `TXDocumentServer.Core.dll`, from the private NuGet feed or Text Control Offline Packages)
- **Package:** `TXTextControl.TextControl.ASP.SDK` (assembly `TXDocumentServer.dll`, from the private NuGet feed or Text Control Offline Packages)
- **.NET Framework:** reference `TXDocumentServer.dll` from the setup
- **Inherits:** `System.Exception` › `TXTextControl.DocumentServer.Json.ParserException`
- **Path:** TX Text Control .NET Server > Reference > TXTextControl.DocumentServer.Json > UnexpectedTokenException Class
- **450 words**
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-documentserver-json/unexpectedtokenexception/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-documentserver-json/unexpectedtokenexception/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-documentserver-json/unexpectedtokenexception/llms-full.txt

---

### Description

Is thrown when calling the method [MailMerge.MergeJsonData](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-documentserver/mailmerge/mergejsondata-method/llms-full.txt) with a JSON string containing an unexpected character.

### Syntax

```csharp
public class UnexpectedTokenException : ParserException
```

```vbnet
Public Class UnexpectedTokenException
    Inherits ParserException
```

### Examples

The following example creates an Unexpected Token Exception instance and configures its help link setting for a document workflow.

```csharp
TXTextControl.DocumentServer.Json.UnexpectedTokenException unexpectedTokenException = new(10, 'A');
unexpectedTokenException.HelpLink = "Quarterly report";
```

```vbnet
Dim unexpectedTokenException As New TXTextControl.DocumentServer.Json.UnexpectedTokenException(10, "A"c)
unexpectedTokenException.HelpLink = "Quarterly report"
```

---

## Nearby

- **Previous:** [UnexpectedEndOfInputException Class](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-documentserver-json/unexpectedendofinputexception/llms-full.txt)
- **Next:** [UnknownLiteralNameTokenException Class](https://docs.textcontrol.com/tx-text-control-dotnet-server/reference/txtextcontrol-documentserver-json/unknownliteralnametokenexception/llms-full.txt)