Your spells file is outdated

[myriverse]

If you have downloaded P99Files32.zip and extracted the files to your EQ folder, then it should be fine. If you know you've done this, then don't doubt yourself.

But you will still occasionally get that error. If the server cannot contact your computer (or vice versa) at that precise moment (between server select and character select), for whatever reason, it registers that you don't have the correct files.