I deleted the file “UserOption.xml” located in “C:\Program Files (x86)\Steam\steamapps\common\Lost Ark\EFGame\Config” and it worked for me.
If I try to connect to the game via a hotspot from my phone it works, sometimes will get the error mid game but I can at least play a bit…
If using my usual network, wont let me in at all just pops 105 error before entering the amazon loading graphic.
I would assume that’s something to do with my network settings/ computer. Can anyone give some insight?
Got this all of a sudden today. Been playing since headstart flawlessly. Played a bit this am and again about an hour ago. Took a shower and came back and now the 105 error. SIGH.
Go through the processes that others have discussed, I am awaiting a response from tech team via Amazon ticket to resolve it as nothing seems to work 
So far, for me this error seems to be related to an unstable GPU overclock
You ever get this resolved??
No I haven’t yet, I’m currently waiting for Amazon to get back to me after raising it with tech support.
Damn, let me know the outcome please. My friend is having same issue and none of the fixes work. I also see Lost Ark replying to a lot of people in chat.
Hi Fostus,
My friend just encountered this 105 corrupted data error yesterday and hasn’t been able to play since, he doesn’t even make it to the character select screen before it crashes with the 105 error code. We have tried everything listed below with no luck.
-Validate files through Steam
-Uninstall and reinstall
-Changing it to full screen
-Disable steam overlay
-Disable all anti-virus programs
-repair game through EAC client in game folder
-Closed all background tasks
I’m at a loss for what to do next, any other suggestions?
Hi. Have been playing smoothly since headstart. So smooth in fact and even though I had already purchased the plat founders pack, I purchased a gold and then on launch purchased the Vanq. Zero issues logging in and getting in the game. Today however (I played this am and than again about 2 hours ago) took a shower and came back to error 105. Tried all of the trouble-shooting steps with zero improvement. NOTHING has changed on my end…
Got it work last night by reinstalling the game. Played for several hours. Went to bed. Woke up today, the game will open in the background and I can hear the birds but it won’t show on the screen, at all…
Hello kevinranders,
I’m so sorry you’re having issues launching Lost Ark.
I really appreciate you’re communicating to us about this issue.
For this issue you can follow this troubleshooting related with the third party program EasyAntiCheat that is linked within Lost Ark:
- Open New World in your Steam Library.
- Right click on Lost Ark’s list title and then Go to Settings < Manage < Browse Local Files.
- Open the EasyAntiCheat folder.
- Run as administrator EasyAntiCheat_Setup executable file.
- Make sure in the drop-down within EasyAntiCheat Service Setup Lost Ark is the selected game.
- Press Repair Service.
- After this process verify Steam Integrity Check files: Steam Support :: Verify Integrity of Game Files (Steam Support :: Verify Integrity of Game Files ).
- Re-launch Lost Ark.
This link also includes another troubleshootings if this process doesn’t work:
Troubleshooting EAC Issues - Support | Amazon Games
Support for Amazon Games. Read support articles or get game & account help from Amazon Games support reps.
Please let us know as soon as possible if after these troubleshooting the problem persist.
Thanks for all your feedback and specially your patience. 
Nope, None of that worked. I have played 120 hours and this issue only started happening yesterday. In the drop down for EAC, it ony listed GAME 580. No option for Lost Ark. After doing that and validating game files, now the game won’t load at all. This time I can’t even hear it running in the background like I could before. Please tell me I didn’t spend 200 bucks on a game that is going to have these issues constantly…
Just uninstalled and reinstallled game. I can hear the game in the background again. It is on the taskbar. It is open in processes. Steams says it is running. I cannot get it to show on the screen.
Thank you for confirming the issue stills persist kevinranders,
Now we are going to setup Lost Ark to start fullscreen from the beginning,
- In your Steam Library right click on Lost Ark title and then select ‘‘Properties’’.
- In ‘‘General’’ Tab you will see a ‘‘Launch Options’’ subtitle and below a Chart; write down in that chart -fullscreen
- Close that Window and restart your computer.
- Make sure your Windows 10/11 doesn’t have any pending updates.
- Re-launch Lost Ark.
I’ll be waiting for your reply.
Thanks for all your feedback and specially your patience. 
this fix did not work for me.
1 Like
Hi Cactacea,
My friend just encountered this 105 corrupted data error yesterday and hasn’t been able to play since, he doesn’t even make it to the character select screen before it crashes with the 105 error code. We have tried everything listed below with no luck.
-Validate files through Steam
-Uninstall and reinstall
-Changing it to full screen
-Disable steam overlay
-Disable all anti-virus programs
-repair game through EAC client in game folder
-Closed all background tasks
I’m at a loss for what to do next, any other suggestions?
Hello Folks!
Thanks for reaching out to our forums with your concerns!
May I ask if you have a secondary hard drive in your PC? If yes so, please try to reinstall the game in the primary hard drive and then verify integrity of the Steam Files. This issue is related to the game’s installation data, so, please make sure to verify integrity of the Steam Files.
Please let me know if your issue is resolved!
See you in Arkesia! 
My friend does not have a 2ND hard drive.
I do have a second drive but I’ve been through this already.
Appreciate the response!