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6

+1. Very unfortunate error message -- it's actually most likely to arise when you've moved the files the "correct" way according to your SCC provider. (e.g. using 'tf rename' for TFS) Moving the project on disk w/o telling TFS, or forgetting to update a sln/csproj file, will result in different error messages in my experience. SUO files are opaque so you're left scratching your head until you do a tfpt treeclean / scorch.
– Richard Berg
Commented Feb 26, 2010 at 20:32
45

Don't forget to restart Visual Studio after deleting the .suo file
– orandov
Commented Jun 11, 2012 at 13:45
9

Oh. So now the .suo file is hidden. Why? Oh, I know why. We are developers and are obviously not capable of handling the added complexity with seeing the .suo file out in the open ;-)
– Torben Koch Pløen
Commented Aug 24, 2012 at 9:06
30

This also works in Visual Studio 2015, though the path to the .suo file has changed to <SolutionFolder>\.vs\<SolutionName>\v14\.suo.
– Greg M.
Commented Aug 31, 2015 at 14:22
4

I'm also using VS 2015. As Greg M. noted, the SUO file is now in a hidden folder called .vs within the solution folder. I was able to fix the error by closing VS, deleting the entire .vs folder and reopening VS.
– ckkkitty
Commented Jul 6, 2016 at 17:34

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Correct minor typos or mistakes
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
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indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
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