opel65, for questions like these contact the author. I'm not against people looking for help but for mods other authors can not upload a fix even if they knew what it was. It's like at work when you don't follow the proper escalation path.
As for advice on how to tell, the error has the name of the mod but I want to point out two things
EsoUI/Libraries/ZO_Templates/ScrollTemplates.lua:797: attempt to index a nil value
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That line starts with EsoUI so that means the author of a mod did something wrong, but it does not say which mod so you can't tell from that.
user:/AddOns/AutoCategory/AutoCategory.lua:243: in function 'AutoCategory.LazyInit'
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That line starts with user and then AddOns, so that line is better because now you can get the name of the mod.
Make sure you are using the latest version and if you uninstall and reinstall and have the same error then let the author know.
https://www.esoui.com/downloads/info...y-Revised.html