# The following modules are missing or built with a different engine version **URL:** \ **Category:** Platform & Builds\ **Tags:** engine-compile, unreal-engine, dll-missing, editor, UE4, question\ **Created:** [May 6, 2017, 9:46pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926 "2017-05-06T21:46:00Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![DW123](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DW123](https://forums.unrealengine.com/u/DW123)\ **Post date:** [May 6, 2017, 9:46pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/1 "2017-05-06T21:46:00Z")
The following modules are missing or built with a different engine version: UE4Editor-MyProject.dll Would you like to rebuild them now? * * * I clicked yes, and it gives me this error: “MyProject could not be compiled. Try rebuilding from source manually.” This is annoying because I wanted to work on my project today, but I can’t open it. ---
**Author:** ![DW123](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DW123](https://forums.unrealengine.com/u/DW123)\ **Post date:** [May 7, 2017, 12:03am UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/2 "2017-05-07T00:03:08Z")
Never mind, I found the issue! I fixed the issue by looking at the Log when it attempts to rebuild the project. ![137056-screenshot+(43).png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/1/0/e/10e3e3bf68e304cc3d1d56fc9e03bc76e3b40882.png) The bottom line gave me the answer, I had to install Windows SDK v8.1 in order for it to successfully rebuild the project. Link: [Windows SDK archive - Windows app development](https://developer.microsoft.com/en-us/windows/downloads/windows-8-1-sdk) Just install this (make sure all the boxes are checked), Open the project, Click “Yes” when the error appears and it will build and open the project editor. Hope this helped 🙂 ---
**Author:** ![K\_netic](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@K\_netic](https://forums.unrealengine.com/u/K_netic)\ **Post date:** [August 21, 2017, 1:38pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/3 "2017-08-21T13:38:35Z")
Just wanted to throw this out there for Linux users - I had this same issue and wasn’t able to open any projects. I’d built from source on the 4.16.3 branch. When saying “OK” and trying to rebuild the library, i found this in the stdout output; ``` fatal error: file '/usr/include/linux/version.h' has been modified since the precompiled header '/home//projects/ue4/UnrealEngine/Engine/Intermediate/Build/Linux/B4D820EA/UE4Editor/Development/Engine/SharedPCH.Engine.h.gch' was built note: please rebuild precompiled header ``` I had recently updated my linux kernel version, and this included the kernel source specified above (the `/usr/include/linux/version.h`). The solution was to rebuild _the editor_ ( `make configure; make` ) and then try to reopen the project. ---
**Author:** ![anonymous\_user\_64f7bb6c](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_64f7bb6c](https://forums.unrealengine.com/u/anonymous_user_64f7bb6c)\ **Post date:** [May 3, 2018, 7:52pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/4 "2018-05-03T19:52:47Z")
It worked for me until I got this message. Does anybody know what it means? ![239816-2018-05-03-61.png](https://d3kjluh73b9h9o.cloudfront.net/original/4X/c/9/f/c9f97b3d433f75ec36ba8cdecdf478466089be36.png) ---
**Author:** ![K\_netic](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@K\_netic](https://forums.unrealengine.com/u/K_netic)\ **Post date:** [May 3, 2018, 8:57pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/5 "2018-05-03T20:57:08Z")
This is not a forum - best to ask a new question with the specifics of your problem. ---
**Author:** ![anonymous\_user\_b3a298c3](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_b3a298c3](https://forums.unrealengine.com/u/anonymous_user_b3a298c3)\ **Post date:** [September 25, 2018, 8:03pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/6 "2018-09-25T20:03:31Z")
I have the same problem, but i have windows 7 not 10… what shall i do? ---
**Author:** ![anonymous\_user\_2ec574a2](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_2ec574a2](https://forums.unrealengine.com/u/anonymous_user_2ec574a2)\ **Post date:** [August 2, 2019, 11:24am UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/7 "2019-08-02T11:24:36Z")
I had the same issue, except my engine built from source (4.22.3 master release, windows 10) did not show any error like that. So, I checked which windows 10 sdk versions I have on my machine, on “Add or Remove Programs”, and following the link above I downloaded the latest microsoft windows 10 sdk that I was missing, and now it seems to compile fine ---
**Author:** ![DW123](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@DW123](https://forums.unrealengine.com/u/DW123)\ **Post date:** [August 2, 2019, 5:42pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/8 "2019-08-02T17:42:46Z")
Windows 7 and 10 are pretty similar when it comes to .dll files… So I’d just try the steps that I posted under the screenshot (If you are still having this issue a near year later… sorry) ---
**Author:** ![anon685683](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anon685683](https://forums.unrealengine.com/u/anon685683)\ **Post date:** [August 21, 2019, 2:53pm UTC](https://forums.unrealengine.com/t/the-following-modules-are-missing-or-built-with-a-different-engine-version/392926/9 "2019-08-21T14:53:13Z")
Ich hatte das gleiche Problem, was ich jedoch einfach beheben konnte. Falls Sie an einem Blaupausen-Projekt arbeiten und eine C++ Datei erstellen wollten, versuchen Sie alle Dateien zu kopieren und in einem komplett leeren Projekt wieder einzufügen. Ich hoffe ich konnte Ihnen damit helfen.