Try run a custom game, when the error pops up, share us your latest LeagueClient log file:
- Go to "C:\Riot Games\League of Legends\Logs\LeagueClient Logs"
- Select the latest "LeagueClient.log" file (Should only be "LeagueClient" - not Ux or Renderer etc.)
- Open it using notepad or a similar program
- Select everything (ctrl + A) and copy it
- Go to pastebin.com and paste the content there
- Set the expiration date to 1 week
- Submit it and share it with us.
And also please share us your process list:
- Press the [Windows Key] (that is the key on the left side of the space bar, between ctrl and alt) + R
- Type cmd in the search bar and click "Ok". You should now see a black window with white letters
- Highlight and copy the following text:
tasklist /v > "%USERPROFILE%\desktop\Process.txt"
- Paste this into the cmd window (black box with white letters) by right clicking and selecting "Paste". Do not use the Ctrl+V shortcut as it will not work!
- Press Enter
- Wait 10 seconds while a text file with the Process List is created
- You should find a Process.txt file on your desktop.
- Open it using notepad or a similar program
- Select everything (ctrl + A) and copy it
- Go to pastebin.com and paste the content there
- Set the expiration date to 1 week
- Submit it