# BarcodeScanner missing assembly

**URL:** <https://forum.opentap.io/t/barcodescanner-missing-assembly/885>\
**Category:** Technical\
**Tags:** plugin\
**Created:** [October 7, 2022, 9:53am UTC](https://forum.opentap.io/t/barcodescanner-missing-assembly/885 "2022-10-07T09:53:57Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![andy1](https://avatars.discourse-cdn.com/v4/letter/a/a8b319/32.png) [@andy1](https://forum.opentap.io/u/andy1)\
**Post date:** [October 7, 2022, 9:53am UTC](https://forum.opentap.io/t/barcodescanner-missing-assembly/885/1 "2022-10-07T09:53:57Z")

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Hi  
I’ve downloaded the BarcodeScanner plugin from [GitLab](https://gitlab.com/OpenTAP/Plugins/keysight/barcodescanner)  
I have an error **“Could not resolve this reference. Could not locate the assembly Keysight.Ccl.Wsl”**  
How can I resolve this ? I can’t see it in the package manager I’m using SDK CE tools with custom GUI in C#.  
A further complaint is **Serializer Package “WPF Controls” is required to load, but it is not installed"** but this is installed and can be seen in the Package Manager as installed?

Many regards and thanks Andy

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**Author:** ![rolf\_madsen](https://avatars.discourse-cdn.com/v4/letter/r/43a26b/32.png) [@rolf\_madsen](https://forum.opentap.io/u/rolf_madsen)\
**Post date:** [October 13, 2022, 10:36am UTC](https://forum.opentap.io/t/barcodescanner-missing-assembly/885/2 "2022-10-13T10:36:18Z")

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Did you resolve this issue?

To me it looks lige the assembly resolver has not been set up in your custom code.

To do this you can call `PluginManager.Load();`

You also need the WPF Controls package installed.

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<div class="post-metadata">

**Author:** ![andy1](https://avatars.discourse-cdn.com/v4/letter/a/a8b319/32.png) [@andy1](https://forum.opentap.io/u/andy1)\
**Post date:** [October 14, 2022, 8:03am UTC](https://forum.opentap.io/t/barcodescanner-missing-assembly/885/3 "2022-10-14T08:03:09Z")

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Thanks Rolf,  
This issue is not fixed yet it will not run in Editor out of the bag.  
I found where **Keysight.Ccl.Wsl** is in Keysight IO library ( I should have read the developers guide earlier) 😊

Still batting on for now

thanks Andy