NullReferenceException in ILGeneratorAgent

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Posted on by LCAS

Hi to all,

In Visual Studio, Every time I save a modification to an AOT object or code I get the following error in the Error List:

Error - System.NullReferenceException: Object reference not set to an instance of an object.

- at Microsoft.Dynamics.Framework.Tools.ILGeneratorAgent.CompilationService.ParseTypeResolve(String module, String metadataPath, String compilerMetadataPath, IEnumerable`1 referencedAssembliesFolders, IEnumerable`1 elements)

Due to this, any warning or error related to the modified object are not evaluated/shown. It seems that on save VS is unable to evaluate the object or X++ syntax properly.

IntelliSense (or how is it called X++ code-completion aid) does not seem to work either properly.

Model build or Solution rebuild temporarily removes the problem and shows correct errors and warning in Error List, but any minor modification and save, will raise this error again. I also tried opening and closing VS.

As if something behind crashes (like a service) which is then not restarted until Dev Box restart.

My dev has had this issue since it was created so I doubt is a local configuration I made (which are just default for solution and project properties)

I have no Idea where else to look at or what else I could try try.

Other things I tried:
- Clean and rebuild

- Shut down IIS express and VS and restarted

- Unloaded and reloaded the project in the solution

- All the above together as /clean, unload, shut down IIS express and VS, restart VS (and IIS express), load and build/

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LCAS 13 on at

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NullReferenceException in ILGeneratorAgent

@Judy

Thanks, that was my next step. Only problem is that I don't really have repro steps and I think it will be hard to get a proper answer or fix.

It appears to be something happening now and then, even in the past, looking at the following:

https://community.dynamics.com/forums/thread/details/?threadid=89bd1a3f-ae15-4321-85f2-5b19e89c56d4

Although here the issue arises on build, whereas for me building clears the output and shows correct errors or warnings, if any.

Now I managed to "solve" it by cleaning ALL Visual Studio cache and tmp files. Let's see if I get the problem again and if so, if this solution really helps.

EDIT: Problem gets temporary solved by cleaning VS cache. In time it will come back still...
To clean cache I followed this solution:
https://learn.microsoft.com/en-us/answers/questions/1221136/visual-studio-2022-clear-local-caches

I copy the main steps that helped in my case and in case the link is discontinued in the future:
Please find visual studio 2022 cache folders by following:
Component Cache

Close Visual Studio (ensure devenv.exe is not present in the Task Manager) and delete the C:\Users\xxxx AppData\Local\Microsoft\VisualStudio\your version xxx\ComponentModelCache directory
Temp folder

Exit iisexpress.
Delete the C:\Users\xxxx \AppData\Local\Temp directory
Judy Microsoft Employee on at

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NullReferenceException Microsoft.Dynamics.Framework.Tools.ILGeneratorAgent.CompilationService

Hi Sir,

I am not sure about this, if the issue persists, it is highly recommended that you create a ticket with Microsoft for further investigate.

Best Regards,

Judy

NullReferenceException in ILGeneratorAgent

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