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When I load up MonoDevelop, it gives me an error, saying how it could not load the C# editor and plugins for my project. I have had this problem for as long as I can remember, and I can still use MonoDevelop to create scripts.

However, MonoDevelop no longer acts like an IDE, more like Notepad+. The lack of plugins causes MonoDevelop to lose even the most basic form of line suggestion. How do I fix this error, and restore the IDE capabilities of MonoDevelop?


Could not load project 'Welp.CSharp.Plugins.csproj' with unknown item type '{E097FAD1-6243-4DAD-9C02-E9B9EFC3FFC1}'

Could not load project 'Welp.CSharp.csproj' with unknown item type '{E097FAD1-6243-4DAD-9C02-E9B9EFC3FFC1}'

Could not load project 'Welp.CSharp.Editor.csproj' with unknown item type '{E097FAD1-6243-4DAD-9C02-E9B9EFC3FFC1}'

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  • \$\begingroup\$ What OS are you using? Have you recently (or not recently) moved any of the concerning folders or files? \$\endgroup\$ – Gnemlock Dec 11 '16 at 21:55
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    \$\begingroup\$ I also wanted to address the edits I made to your post; Youl notice I have provided the error as text. Text errors are much more useful, as users can actually copy them to look up. I also removed your other image, as frankly, there was no point to it. We believe you. You do not need to show us screen to confirm that this is happening. \$\endgroup\$ – Gnemlock Dec 11 '16 at 21:56
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This is not the first time someone has raised an issue with an IDE reporting "unknown type '{E097FAD1-6243-4DAD-9C02-E9B9EFC3FFC1}'".


There are multiple answers, and they all seem to arrive at the same consensus: To fix this problem, and actually re-enable the IDE functionality, you should reinstall the software. This seems to be the only solution that has resulted in the IDE functionality resuming, and also covers the solutions for other potential causes:

  • Some users have been able to simple "repair" their original installation; others have not. If the option is available, it is certainly worth the try.
  • The problem may be caused by incorrectly installed .NET frameworks.
  • The IDE might have a differant issue, where it thinks it can not support your project.
  • The problem may be caused by an inconsistency in the .proj file, but feedback suggests that manually fixing this error will not resume IDE functionality. If you want to try, the suggestion is to remove "<ProjectTypeGuids></ProjectTypeGuids>".

If you try this option, make sure you back up your projects, first. It might also be a good idea to double check the version of Unity you are using, if you do not automatically update. Older versions of the software are available from the website, if you do not wish to download the latest release.


It is worth noting that in the previously linked question, the top answer addresses this error as a result of piracy. This is very unlikely, especially in this case, given that MonoDevelop is a free IDE, and provided alongside Unity.

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