Hundred of errors after update to Visual Studio version 17.12.3!

Hossein Dabbaghan 21

I updated Visual Studio to version 17.12.3 and now, there is hundred of errors in Building project! My .net Core project was work correctly before updating. I checked errors but they are nonsense! All codes are correct.

Viorel 118.9K Reputation points

2025-01-03T10:41:39.1866667+00:00

What errors did you check?
Hossein Dabbaghan 21 Reputation points

2025-01-03T11:07:32.5366667+00:00

All error are about additional <div> tag without end (<\div>).

But I checked them. Divs are correct.

Also sometimes error with bundle minifier in building.
Hossein Dabbaghan 21 Reputation points

2025-01-03T11:46:06.07+00:00

Now, all errors gone and there is just one error:

The target "BundleMinify" does not exist in the project.
Viorel 118.9K Reputation points

2025-01-03T11:59:32.93+00:00

Maybe the last error will disappear too.
Hossein Dabbaghan 21 Reputation points

2025-01-03T17:44:46.2333333+00:00

No, it doesn't disappear.
Craig Burley 0 Reputation points

2025-01-09T17:19:33.1366667+00:00
I'm hitting the same problem (except the error count is well over 20,000) on a large MVC project — which had no build errors before I agreed to upgrade VS.

To remediate I've:

Upgraded the extensions I have (there are four of them, two of which needed upgrading)

Disabled all four extensions

Repeatedly shut down and restarted VS

Given the machine the night off (lol, but that sometimes actually works IME)

Rebooted the machine

Deleted (while VS was shut down) the .vs, bin, and obj directories in the project dir

None of this has had any visible effect on the issues.

Unfortunately, I'm up against a deadline of 2pm EST tomorrow (Friday 1/10) for a feature freeze and this is pretty much blocking me.

So, absent a quick fix, what's the best way to downgrade VS to what I was running earlier yesterday, which was working adequately?

3 answers

Anna Xiu-MSFT 30,556 Reputation points Microsoft Vendor

2025-01-06T03:17:23.11+00:00

Hi @Hossein Dabbaghan ,

Welcome to Microsoft Q&A!

You can close all running VS instances and try to delete the hidden .vs, bin and obj folders in the project folder.

Then, clean and rebuild your solution.

Sincerely,

Anna

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Hossein Dabbaghan 21 Reputation points

2025-01-06T03:53:59.32+00:00

I've tried it 50 times. This doesn't work. I also installed VS by VS installer. But errores are left!

Hossein Dabbaghan 21 Reputation points

2025-01-06T03:57:57.8366667+00:00

I've tried it 50 times. This doesn't work. I also installed VS by VS installer. But errores are left!

Anna Xiu-MSFT 30,556 Reputation points Microsoft Vendor

2025-01-06T09:05:01.26+00:00

Hello, could you share us a screenshot of the error message?

Did you install any third-party extensions?

You can temporarily disable or uninstall the installed extensions under Extensions > Manage Extensions > Installed.

Hossein Dabbaghan 21 Reputation points

2025-01-11T06:01:28.99+00:00

I have done before. It doesn't work.

Hossein Dabbaghan 21 Reputation points

2025-01-11T06:12:57.55+00:00

I've done that so many times. It doesn't work.
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Craig Burley 0 Reputation points

2025-01-09T20:04:50.2633333+00:00

Reverting the upgrade (back to 17.11.5 in my case) has proven to be a solid workaround.
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Hossein Dabbaghan 21 Reputation points

2025-01-12T04:56:03.5866667+00:00

I fixed the "BundleMinify" error by installing "BundlerMinifier.Core". But now there is 170 error that they don't mean. I checked them. There is no error in code!
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Hundred of errors after update to Visual Studio version 17.12.3!

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