This error can happen if PUBG is unable to load Steam properly.
Please try the following troubleshooting steps:
- Try to launch Steam and PUBG as an administrator
- Try to re-install Steam from Control Panel
- Try to change or remove all Steam Launch options (if any)
- Editing Launch settings to -autoconfig or -windowed
- Right-click on the game title under the Library in Steam and select Properties.
- Under the General tab click the Set launch options… button.
- Enter the launch options, -autoconfig or -windowed (be sure to separate each code with space) and click OK.
- Close the game’s Properties window and launch the game.
If the issue persists contact PUBG Player Support with the screenshot of the error.