grasshopper identified as a .net plug-in but .net support not found on this computer

There is a thread on this that is several years old but it appears that it is dormant so I am starting a new one. It seems that there have been others with this issue.

To recap, I am running Rhino 4.0 SR9 Evaluation with Grasshopper build 0.8.0066. It all works fine for a while but then I get to a situation where Rhino will run but it will not load Grasshopper. The message is "grasshopper identified as a .net plug-in but .net support not found on this computer."

There is no pattern yet as to what triggers this. I have been working with the C# Script Component including a reference to an external .dll. I have found that the error often occurs when I close Rhino and restart it.

I have found that doing an uninstall and reinstall of Rhino corrects the problem. It is not necessary to restart Windows or reinstall Grasshopper. The last time I did this I saved the entire "Program Files (x86)\Rhinocerous 4.0" directory and compared the corrupted one to the reinstall. They are identical so apparently the problem is not in any of those files. I didn't systematically compare the ProgramData files but they don't look like they store any settings. So my guess is that there is a Registry setting?

Any ideas appreciated. By the way, I am not trying to avoid purchasing a license; just doing some exploration while on vacation away from my office which owns many licenses.

Thanks.

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Permalink Reply by Giulio Piacentino on June 14, 2012 at 1:00pm

Hi Mario

from the description this sounds like a challenging problem. Could you post a screenshot, please, next time the error occurs?

Thank you,

- Giulio
_________________
giulio@mcneel.com

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Permalink Reply by Clorin on August 9, 2012 at 9:07am

I found this thread while researching the same problem. I will try the reinstall now but wanted to post the error I have been getting while I was here.

I am running Rhino 4 SR9 and the newest release of Grasshopper. Everything else works fine except one previously save grasshopper file I have that crashes Rhino with the following error message every time I try to reference a geometry. If I try running Rhino in safe mode and performing the same procedure I get the error message shown in the attached screenshot and am unable to load Grasshopper. I did not have this problem before updating to the newest release of Grasshopper.

Thanks,

Michael

Description:
Stopped working

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: rhino4.exe
Problem Signature 02: 4.0.2011.309
Problem Signature 03: 4d77cd07
Problem Signature 04: System
Problem Signature 05: 2.0.0.0
Problem Signature 06: 4a275e12
Problem Signature 07: 130a
Problem Signature 08: 0
Problem Signature 09: System.StackOverflowException
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 1033

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Permalink Reply by Clorin on August 9, 2012 at 9:18am

Unfortunately re-installing Rhino did not seem to help. I will also try uninstalling and re-installing Grasshopper and the .Net and runtime files.

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Permalink Reply by Mario Guttman on August 9, 2012 at 11:48am

Afraid I can't help much but just so you get a reply. After my original post Gulio asked me for a screen shot of the problem. Of course then it didn't recur. So something made the problem go away. I haven't been working on the same computer recenty so I don't know if it is really gone. In summary: it isn't just you; it is a real issue; we don't know exactly what is causing it. In my case I was doing some work in Visual Studio at the same time. Were you doing anything like that?

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Permalink Reply by Clorin on August 9, 2012 at 12:40pm

Rolling back to an older version of grasshopper worked for me. The exact script I was having trouble with is reference in this thread for anyone looking for more information:

http://www.grasshopper3d.com/forum/topics/incident-solar-vb-net-pro...