The controller for path '/login' was not found or does not implement IController

I recently upgraded nop from 2.5 to 2.6 and now I'm getting that error message. What does this message mean and how can I fix it? Did something go wrong during the upgrade?

more details please

is it when you click on a specific link, or when you try to go to the site at all?


I had this error happen when I had a custom theme that referenced links that had changed with the upgrade.

You can get more on the error by going into the database and running the query

SELECT TOP 100 [Id]
      ,[LogLevelId]
      ,[ShortMessage]
      ,[FullMessage]
      ,[IpAddress]
      ,[CustomerId]
      ,[PageUrl]
      ,[ReferrerUrl]
      ,[CreatedOnUtc]
  FROM [dbo].[Log] order by [Id] desc

and looking at the most recent events, the full message should provide better details about what is going on.