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How to fix .NET Runtime version 4.0.30319.0 - Loading profiler failed during CoCreateInstance Error.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(121.6, 90%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBM%3C/text%3E%3C/svg%3E)
Bhushan Mendhe
0
Reputation points
Hello,
I am seeing this error in the event logs:
.NET Runtime version 4.0.30319.0 - Loading profiler failed during CoCreateInstance. Profiler CLSID: '{2EB6DCDB-3250-4D7F-AA42-41B1B84113ED}'. HRESULT: 0x80040154. Process ID (decimal): 28340. Message ID: [0x2504].
The environment variables are being set properly. The COR_ENABLE_PROFILING is set to 1 and the COR_PROFILER variable is being read correctly.
The application uses the .NET Framework profiler. I can see the CLSID in the registry but it gives me this error again and again.
I am fairly new to this so I am not able to resolve it.
Can anybody help?
Developer technologies | .NET | .NET Runtime
Developer technologies | C++
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(201.6, 57.00000000000001%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMY%3C/text%3E%3C/svg%3E)
Minxin Yu 13,501 Reputation points Microsoft External Staff2023-06-28T08:36:38.59+00:00 What type of C++/C# project are you using? And can you provide the steps to reproduce the problem?
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Bhushan Mendhe 0 Reputation points
2023-06-28T08:41:37.68+00:00 I am using a library developed by Microsoft back around 2010. Here is the source of the library: https://github.com/microsoft/TestApi/
The problem started when I renamed the TestApiCore project to something else. But I made sure that I do it in the FaultInjectionEngine which is a C++ project as well. But now when I build the projects and try to use it. It is showing me this error.
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Minxin Yu 13,501 Reputation points Microsoft External Staff
2023-06-29T09:01:14.5433333+00:00 Since the issue is specific to the TestApi library, you can report on Github. You can also contact Contributors for help.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(108.80000000000001, 7.000000000000001%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMG%3C/text%3E%3C/svg%3E)
Mike Gledhill 0 Reputation points2024-04-19T11:01:27.67+00:00 I'm getting the same error in Event Viewer, for a completely different C# project.
Interestingly, this is a .Net 4.51 project, and it started happening when we uninstalled unsupported versions of .Net 6.0.28 on our IIS server. This server does have .Net 7.0.17 installed on it though.
We haven't found a solution yet.
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