Which addons are you using on your first char and on your alt chars?
Check the following addons, as they use libFilters, and tell us the version of the addons you are using please:
AdvancedFilters
FCOItemSaver
FCOCraftFilter
AwesomeGuildStore
ItemSaver
Are your addons up2date? Is every needed library enabled on your altsso libFilters and the enabled addons can work properly?
Are you able to disable the error messages by disabling one/multiple of the addons above?
Does it happen directly as you login or do you need to do something before, like open the inventory or drag&drop any item someplace?
The best way to reproduce is write down a list with steps like:
1. login with char 1 having addons enabled: AdvancedFilters v1.5.0.5 (no others)
2. Open inventory
3. Logout
4. Login with another char having addon enabled: AdvancedFilters v1.5.0.5 (no others)
-> Error message appears directly now
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