# UnknownParseErrorException Class

> Is thrown when calling the method MailMerge.MergeJsonData and the internal JSON parser encounters an unknown error.

- **Product:** TX Text Control .NET for WPF
- **Section:** Reference
- **Kind:** Class
- **Introduced:** 24.0
- **Namespace:** `TXTextControl.DocumentServer.Json`
- **Package:** `TXTextControl.TextControl.WPF.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 for WPF > Reference > TXTextControl.DocumentServer.Json > UnknownParseErrorException Class
- **Web URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownparseerrorexception/
- **LLMs URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownparseerrorexception/llms.txt
- **LLMs-Full URL:** https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownparseerrorexception/llms-full.txt

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## On This Page

- [Description](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownparseerrorexception/#description)
- [Syntax](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownparseerrorexception/#syntax)
- [Examples](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownparseerrorexception/#examples)
- [Members](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownparseerrorexception/#members)

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## Nearby

- **Previous:** [UnknownLiteralNameTokenException Class](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-json/unknownliteralnametokenexception/llms.txt)
- **Next:** [TXTextControl.DocumentServer.PDF namespace](https://docs.textcontrol.com/tx-text-control-dotnet-wpf/reference/txtextcontrol-documentserver-pdf/llms.txt)