---
title: "How do I resolve missing DLL errors caused by incorrect DLL probing paths?"  
description: "How do I resolve missing DLL errors caused by incorrect DLL probing paths?"  
author: "Pedro Araez"  
published: 2026-09-21  
canonical: https://answers.mindstick.com/qa/117254/how-do-i-resolve-missing-dll-errors-caused-by-incorrect-dll-probing-paths  
category: "Configuration"  
tags: ["configuration", "dll", "assembly"]  
reading_time: 1 minute  

---

# How do I resolve missing DLL errors caused by incorrect DLL probing paths?

## Probe Path Confusion

Your executable lives in a subfolder, yet the runtime cannot locate a required assembly. The default probing path only checks the application base directory, which is why you see a FileNotFoundException at runtime.

### Configuring explicit paths

Edit your `app.config` or `web.config` and add a `probing` element under `runtime`. This tells the CLR exactly where to look.

```xml
<!-- Specify additional private bin paths for assembly resolution -->
<configuration>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <probing privatePath="bin\libs" />
    </assemblyBinding>
  </runtime>
</configuration>
```

- Keep third-party dependencies in a dedicated folder, not scattered across the project root.
- Ensure the `privatePath` is relative to the application base.
- Validate the folder permissions match the account running the process.


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Original Source: https://answers.mindstick.com/qa/117254/how-do-i-resolve-missing-dll-errors-caused-by-incorrect-dll-probing-paths

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