First things first, check that no instance of Palia running in background in task manager and close it if so.
This error typically means your user doesn’t have the proper permissions to launch the game. This can be fixed by right clicking on the launcher, then clicking “Run as administrator”.
This error could show on other operating systems as well, but please note that we currently only support Windows 10 64-bit or higher and won’t be able to troubleshoot other operating systems.