Migrating from CMS 7 to 8 gives error

[jonroberts24]

Hi Nathan, As discussed earlier on Twitter this is the error message that we get when we migrate from Umbraco 7.15 to 8.9.1.

I'll strip out the DLLS like you mentioned and let you know how we get on. Thanks for all your help, Jon

[nathanwoulfe]

Pretty sure I know what happened here - installing V8 will have created a new entry in the settings table, but there should only be one.

If you delete the newer of the two, it should work fine - all the new columns will exist, and should have the correct defaults, plus the original v7 settings.

Also a good idea to remove the v7 DLLs and app plugins stuff too, since it's not needed anymore.

[nathanwoulfe]

I'll update the installer too to not add a new row if one exists already, assuming this is the cause.

If removing the row doesn't work, I'd try deleting both and reinstalling, which should create the new entry.

[jonroberts24]

Great news - thank you so much for getting back so soon 👍 Have a great Christmas if I dont speak to you before,

Jon

[jonroberts24]

Hi, Removing that row from the database fixed the issue 👍 Thank you for all your help, Jon