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I've migrated a lot of Umbraco 7 sites already, but this one is a reall pain in the ass..
Step already did before upgrading:
Then this error appears: Value cannot be null. Parameter name: source (in Umbraco.Core.Persistence.Factories.PublicAccessEntryFactory.BuildEntity)
And no content tree is shown.
Does anybody have a clue where to begin with this one? Tried everything: rebuilding cache, rebuilding Internal index, restarting site etc, but nothing seems to help...
Any help would be appreciated!
Looks like there might be something awry in the UmbracoAccessRule database table.
When you right click a content node in Umbraco you have the option to set a 'Public Access' rule - you choose which Member Groups are allowed to access the content, and you get to pick a 'login' page and an 'error page' to display if the person isn't logged in.
Now your site might not have a protected area, or at some point it might have, or somebody did a test or something - in the old days of Umbraco these rules were stored as files in the app_data folder, I think around 7.2 they got moved into a database table... which is I think called UmbracoAccessRule...
So if you can run
Select * from umbracoAccessRule
from your database table, then I reckon your going to find an entry in there, that has some kind of null value or is referencing a content id or member group id, that no longer exists... and can no longer be 'mapped' to the V8 version of the PublicAccessEntity...
If you delete that rogue entry it should all be back and running ok...
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