Could not load file or assembly ### or one of its dependencies after publish

Question

My problem is that when I ran my project locally it worked just fine. But when I publish to my IIS server I get an error saying.

Could not load file or assembly 'Microsoft.Owin' or one of its dependencies

When I fixed the Microsoft.Owin problem there was a problem with System.Web.Http. Why is it only a problem after I publish?

Could you please tell the exact exception message you are getting including stack and source details. — keerti, Dec 15 '16 at 11:06
@KeertiSystematixInfotech Sure thing! http://pastebin.com/1mUY1f3t — Alpo, Dec 15 '16 at 11:37

score 1 · Accepted Answer · answered Dec 19 '16 at 08:08

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For some reason that I can't explain (please do if you know why) it worked to use my web.release.config instead of web.debug.config. I copied my entire web.debug.config to web.release.config and it worked.

answered Dec 19 '16 at 08:08

Alpo

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score 1 · Answer 2 · answered Jul 03 '19 at 15:09

A little late to the party, but a recent fix that I've found for this is if publishing from Visual Studio, to make sure that you select the option to remove all additional files at destination. I upgraded my .NET framework, and it wasn't replacing the recompiled packages with the newer versions on Publish.

score 0 · Answer 3 · answered Dec 15 '16 at 11:05

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Set your project References CopyLocal property to true.

answered Dec 15 '16 at 11:05

Andrei Filimon

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Is there a way to do that in all of them at once? – Alpo Dec 15 '16 at 11:32
I've gone through and set every reference to CopyLocal and it still doesn't work – Alpo Dec 15 '16 at 11:47
Your application pool on the IIS server runs under same .NET framework as the referred dll's? – Andrei Filimon Dec 15 '16 at 12:10

score 0 · Answer 4 · answered Mar 17 '21 at 06:38

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in my case it was the unvalid certificate in MyProject -> Properties -> Signing were I ticked "Sign the Assembly"

answered Mar 17 '21 at 06:38

Julian Müller

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score 0 · Answer 5 · answered Nov 16 '22 at 16:54

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I just encountered this issue when deploying to an Azure App Service via Devops CI.

The fix was to restart the App service. Once it had JIT compiled after the first call to the web service, the error disappeared and it began working again as normal.

answered Nov 16 '22 at 16:54

Rory McCrossan

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Could not load file or assembly ### or one of its dependencies after publish

5 Answers5