Im having the same issue reported in this question Upgrade Site collection to 15 in SharePoint 2013 Failed
After the process of Mounting the content dabase, everythins was working fine, but when I tried to the visual upgrade, i get errors on the subsites Feature upgrade action 'CustomUpgradeAction.EnsureVariationsInfrastructure' threw an exception upgrading Feature 'Publishing' (Id: 15/'22a9ef51-737b-4ff2-9346-694633fe4416') in Web xxxxxxxxx Exception: Invalid field name. {8484dbaf-e6d2-4f98-9aa7-e19f89260224} /Variation Labels 0304649f-8ac5-a0ef-52b4-0d9dee0f3098
Has anyone been with this error.
On this SharePoint 2013 farm, I already upgrade another web application, coming from the same SP2010 Env, also with variations configured and with no problems.