fatal error C1083: Cannot open include file: 'dte80a.tlh': No such file or directory

Development Programming & Scripting
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Hi all,

I just downloaded UE 5.6.1 and started a new project and got below error when it compiles:

fatal error C1083: Cannot open include file: ‘dte80a.tlh’: No such file or directory
include “dte80a.tlh”

Can someone help?

Thanks

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Hey @SungshikYim! Welcome back!

So this problem is pretty rare, but apparently is a corruption in the files from back in the UE4 days… From what I understand, you need to delete “Engine\Intermediate\Build\Win64\UE5Editor\Development\VisualStudioDTE”, then rebuild the engine, but that folder doesn’t exist for me, personally. Possibly just reinstall Unreal Engine. It’s something to do with Microsoft Visual Studio, so maybe update that as well and then reinstall.

Hope that helps, let us know your progress!

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Thank you. Uninstall and reinstalling UE5 did the trick.

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Hey @YhLad69 ! Did you make sure your Microsoft Visual Studio installation was up to date before rebuilding from source? Would you be able to install it via the launcher and check to see if it happens with that installation as well?

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So I have built 5.5 source perfectly fine beforehand seems to just be happening with 5.6 source.

Normal UE installs and works fine just a UE source issue. I have fresh installed windows and using the correct VS 2022 components & workloads. Copied from a friend who can build UE source 5.6 fine :confused:

super weird issue cant figure it out at all been 5 days now at it trying to figure it out. Deleting 5.6 source downloading from git, github and repeating always same errors

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@YhLad69 I would try opening a new thread and labeling it with tags denoting that it’s a source-build situation, as that would be different from this thread and should be a different problem entirely, unfortunately. :frowning: That detail kind of makes it a whole different thing. BUT you should get more replies because new posts are often sifted through by forum vets and a lot of those build from source! Good luck!

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I managed to get it working by disabling UBA completely & supressing some vulnerabilities errors to warning. Im not sure if that was the direct cause but I managed to get it building :slight_smile: Sorry for the late reply was very busy with work.

Appreciate your responses though mate!

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