If you have updated SKSE to the latest version and it matches your game version, but you still get the error, one of your specific mods is outdated.
You have three main options, depending on your preference for stability vs. new content. skyrim dll plugins you have installed require a new version
This is the solution for 90% of users. You likely have an old version of SKSE installed that doesn't match your current game version. If you have updated SKSE to the latest
To understand the fix, you first need to understand the relationship between the game, the Script Extender, and your mods. but you still get the error