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Project fails to build on 4.18.3 - -waitmutex" exited with code 5. Please verify that you have sufficient rights to run this command

I have a project that's built using 4.16.3. I tried to build the project on 4.18.3 today, and got a bunch of errors, the reason of which I fail to understand. One such error is :

H:\GitHub\PaintGame 4.18\PaintGame.uproject" -waitmutex" exited with code 5. Please verify that you have sufficient rights to run this command.

I've never encountered anything of this sort before, and I have tried looking around but nothing seems to help. Any help or a nudge in the right direction is greatly appreciated.

Product Version: UE 4.18
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asked Mar 13 '18 at 06:22 AM in Packaging & Deployment

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2 answers: sort voted first


Maybe you should see in the log file what was the problem during your packaging.

Anyway, here's some solutions i have that solved few packaging problem, check if one of them help you:

  • see if you don't have multiple instances of your project running

  • check the length of the path of some assets

  • check if all your blueprint compile correctly

  • if you are using c++, check if all your code compile correctly

I hope it will help you, without your log file it is not so easy. If you still can't package your project, please provide your log file

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answered Mar 13 '18 at 11:20 AM

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avatar image hussainAbis Mar 13 '18 at 08:45 PM

Thanks for the reply Rayster. Unfortunately, I'm still stuck though. I had closed UE completely before starting the process on 4.18, and the BPs and C++ Code compiles just fine on 4.16.3, so I presume that shouldn't be an issue ? I followed your suggestion of checking the path length, but I'm still at the same place I started. Here's my log file

Thanks for your time and all the help.

paintgame.log (42.6 kB)
avatar image Rayster Mar 15 '18 at 02:02 PM

Hi, sorry for the late answer.

Did you try to replace all your

#include "Kismet/HeadMountedDisplayFunctionLibrary.h"


#include "HeadMountedDisplayFunctionLibrary.h"


Otherwise I do not really see what's going on with your issue

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In my case, the error was due to an erroneous Blueprint function return type declaration: UFUNCTION(BlueprintCallable, Category = Sound) static unsigned int playSound(...)

Instead of unsigned int, I had to use uint8 for instance to make UE happy. https://answers.unrealengine.com/questions/98206/missing-support-for-uint32-int64-uint64.html

Obviously, the error message did not help find this one. The actual error can be found in the VS output tab instead of the error list.

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answered Jun 06 '18 at 04:51 PM

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