# Plugins fail to load due to license (?) when opening Editor for the first time after reinstalling one of them

**URL:** <https://forum.opentap.io/t/plugins-fail-to-load-due-to-license-when-opening-editor-for-the-first-time-after-reinstalling-one-of-them/1052>\
**Category:** Technical\
**Created:** [March 1, 2023, 3:02pm UTC](https://forum.opentap.io/t/plugins-fail-to-load-due-to-license-when-opening-editor-for-the-first-time-after-reinstalling-one-of-them/1052 "2023-03-01T15:02:02Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![tatiana.boye](https://avatars.discourse-cdn.com/v4/letter/t/ba8739/32.png) [@tatiana.boye](https://forum.opentap.io/u/tatiana.boye)\
**Post date:** [March 1, 2023, 3:02pm UTC](https://forum.opentap.io/t/plugins-fail-to-load-due-to-license-when-opening-editor-for-the-first-time-after-reinstalling-one-of-them/1052/1 "2023-03-01T15:02:02Z")

</div>

We recently switched to a licensed version of `OpenTAP 9.17.4` as our company grew out of the eligibility for the CE version. We use floating licenses.

I seem to be facing an issue related to the commercial version now.

I have a machine where I develop plugins, and sometimes build and install them locally. Every time I rebuild and reinstall a plugin, first opening of Editor results in errors, namely it won’t load any plugins (neither the ones that weren’t updated nor the one that was). If I reopen Editor right away, the issue is gone.

The issue is 100% reproducible.

Any help is appreciated.

---

<div class="post-metadata">

**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:** [March 2, 2023, 1:27pm UTC](https://forum.opentap.io/t/plugins-fail-to-load-due-to-license-when-opening-editor-for-the-first-time-after-reinstalling-one-of-them/1052/2 "2023-03-02T13:27:31Z")

</div>

Hi @tatiana.boye,

Could you elaborate a bit on what the errors are?

Also, can you reproduce the issue with a basic project?

---

<div class="post-metadata">

**Author:** ![tatiana.boye](https://avatars.discourse-cdn.com/v4/letter/t/ba8739/32.png) [@tatiana.boye](https://forum.opentap.io/u/tatiana.boye)\
**Post date:** [March 6, 2023, 10:26am UTC](https://forum.opentap.io/t/plugins-fail-to-load-due-to-license-when-opening-editor-for-the-first-time-after-reinstalling-one-of-them/1052/3 "2023-03-06T10:26:41Z")

</div>

@rolf_madsen It reads XML config files and fails creating DUTs, Instruments etc.

As an example (real plugin/class names are removed):

```csharp
2023-02-24 17:09:47.893581 ; Serializer ; Error ; XML Line 26: Unable to create instance of Python.<plugin name>.<class name>.
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; Exception: Object reference not set to an instance of an object.
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at Keysight.OpenTap.Plugins.Python.PythonDutWrapper.load(String name, String moduleName)
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at Python.<plugin name>.<class name>.load_instance()
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at Python.<plugin name>.<class name>..ctor()
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at Python.<plugin name>.<class name>..ctor()
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; --- End of stack trace from previous location where exception was thrown ---
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at OpenTap.Plugins.ObjectSerializer.TryDeserializeObject(XElement element, ITypeData t, Action`1 setter, Object newobj, Boolean logWarnings)
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at OpenTap.Plugins.ObjectSerializer.Deserialize(XElement element, ITypeData t, Action`1 setter)
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; Exception caught at:
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at System.Object Deserialize(System.Xml.Linq.XDocument, OpenTap.ITypeData, Boolean, System.String)
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at OpenTap.ComponentSettings Load(System.Type)
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at ResultT Invoke(ArgT)
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; at OpenTap.ComponentSettings GetCurrent(System.Type)
2023-02-24 17:09:47.893581 ; Serializer ; Debug ; ...

```

It seems it doesn’t happen to C# plugins, but only to Python based plugins.

Hope this helps. I’ll try to reproduce it with a basic project later on.

---

<div class="post-metadata">

**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:** [March 12, 2023, 5:47am UTC](https://forum.opentap.io/t/plugins-fail-to-load-due-to-license-when-opening-editor-for-the-first-time-after-reinstalling-one-of-them/1052/4 "2023-03-12T05:47:13Z")

</div>

Ah ok, I think it might help if you try to port it to v 3 of the Python plugin - the plugins there behave a bit closer to how the C# plugins works. Or is there a reason why you still use v 2?

---

<div class="post-metadata">

**Author:** ![tatiana.boye](https://avatars.discourse-cdn.com/v4/letter/t/ba8739/32.png) [@tatiana.boye](https://forum.opentap.io/u/tatiana.boye)\
**Post date:** [March 13, 2023, 9:27am UTC](https://forum.opentap.io/t/plugins-fail-to-load-due-to-license-when-opening-editor-for-the-first-time-after-reinstalling-one-of-them/1052/5 "2023-03-13T09:27:00Z")

</div>

The only reason is lack of time… But this issue might be yet another reason to prioritize it.