Hey guys! So I am pretty new to Unreal (about a month and a half now), and I do almost everything in c++ and try to not use blueprints unless I have to. However, for the most part I have had pretty smooth sailing with code up until a few days ago, and I learned that I could install Unreal debugging symbols and that I had apparently not checked that when originally installing it. So I went into the epic launcher, library, then clicked the arrow under my unreal version (5.4.3) and clicked the debugging symbols option and installed. It installed with no errors, however when I tried to launch unreal from the epic launcher it gives me “Launch Failed. Could not launch Unreal Engine. Please verify the installation. Error Code: LS-0013” . So, I tried verifying the files and no errors pop up or anything, but still it will not launch. Interestingly though, my Unreal.exe which is on my desktop DOES launch w/o issues and my unreal symbols work in my code fine. So I have been just using that method since then, assuming it may work itself out in a few days after my pc restarted and stuff, but that isn’t the case as today I attempted again with no luck. Any suggestions? Thanks!
Bump? No one has any ideas?
Hey there @Oxyten! So the error only occurs when launching that same version from the Epic Games Launcher? If the editor symbols are removed, does that instance still launch?
Well I don’t have any other unreal versions (They are huge downloads, I don’t have the space. For the symbols alone it was 30+gb). But yeah when I open epic launcher and try to open Unreal from there it gives me that error. I’ve tried verifying and it doesn’t throw any errors through verifying, but does so at launch attempt everytime. I open Unreal fine using the Unreal.exe on my desktop. And I have not tried deleting the symbols as I’m not sure how I can specifically just delete the debugging symbols, unless its possible to just uncheck it where I checked it to download it? I don’t think that would work, but I could be wrong lol. And if it doesn’t I’m not sure how to delete just the debugging symbols. Is there someway I can clear a cache somewhere? I know this often fixes problems with games/other applications.
I believed unchecking the symbols does allow you to remove their registration, but I’ve never had to uninstall them to check. I’m installing a fresh set now to try it out.
Though to answer your other question, yes the engine has some caches that can be regenerated, and that was my next recommendation, but I’d also recommend backing them up first, in case this causes another issue. Since DDC is mostly shaders, it will cause a shader rebuild.
The DerivedDataCache and Intermediate folders.
So I deleted everything in both folders (made back ups just in case), then unchecked debugging in options, then verified again, and still get the same error. This is super annoying and looking like I’m going to have to uninstall the whole launcher which I am super scared to do because I don’t know what it will do to my projects/c++ classes i’ve made in those projects. Super weird and makes no sense and insane there is no info about it online anywhere.
Thanks for your help, but it’s looking like my only option is going to be uninstalling unreal alltogether and reinstalling which I am not prepared to do considering I don’t know what it does with projects and files and even if it’s not supposed to delete them, I’m not gonna risk it until I’m finished with my project and zip it up somewhere else lol.
Your projects should be safe in your file system, uninstalling and reinstalling the engine should have no affect. That said feel free to make a backup before you remove the engine. I always recommend keeping backups either locally or online through source control if possible.
Bro even uninstalling and reinstalling did not work… I don’t know wth the issue is.
Hey, just giving you an update. It is fixed. I am not really sure what exactly worked, but if anyone runs into this problem this is everything I did before it started working again. A: Delete cache as mentioned by SupportiveEntity, Uninstall Debugging Symbols, Verifying, Running epic and Unreal as admin, then completley uninstalling and reinstalling Unreal. (None of this worked but it may be neccessary to do all of these things for it to randomly start working again). After doing all of these things I just kept closing Epic from my task manager then opening as administrator and launching with the button in the top right (Dont do it from the library itsself as I tried this after it worked the first time and it gave me an error again). HOWEVER, after it gave me the error again, I once again closed with task manager, opened as admin and launched with top right button, and now it launches every time from library or the button in the top right of epic. Weird issue and I have no clue what about repeatedly closing epic and opening as admin and attempting to launch unreal with the top right button could possibly fix any problems, but it did.
Thanks for the update! Just to understand, you were admin killing the launcher processes or the engine processes?
I was killing epic games (couldn’t have killed unreal as it would never launch cus of the error) with task manager then just reopening epic games as admin and using the unreal launch button in the top right of epic games. After about 3x it worked then I tried closing everything again to see if it was a fluke or fixed, but this time I tried launching unreal through epic from the library section and got the error again so I repeated the process, kill epic through task manager, open epic as admin and launch with top right unreal button. And after that everything works now, including the library button.
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