Thz for the tip Thurallor.
I deleted the "PrimeLoadSettings.plugindata" file, and it worked for a while, after a relog same failure, but with another file.
So i deleted all PluginData files. But the plugin keeps creating them, and when i relog, same problem as before.
...nData/********/[EN-RP] Laurelin/AllCharacters/PrimeLootLocks.plugindata:22: ']' expected near ',
...ine\Plugins\PrimePlugins\RaidTools\WindowManage r.lua:22: Unable to parse file
...Rings Online\Plugins\PrimePlugins\RaidTools\Main.lua:21: Failed to import package "PrimePlugins.RaidTools.WindowManager".