[TYPO3] upgrade 3.8.0 -> 4.0.2

[Daniel Schledermann]

PEF wrote:
> I want to upgrade from 3.8.0 -> 4.0.2 but it results in a lot of 
> mysql_fetch_row-warnings in the back-end:
> 
> - when accessing a page in Page-mode (line 801)
> - when accessing a page in View-mode (line 801)
> - when accessing a page in List-mode (line 814)
> 
> - when using DB check -> Record Statistics (line 801)
> - when using DB check -> Database Relations (line 801)
> 
> When running a Compare check from the Install tool, it suggest creating 
> these tables a.o.:
> - tt_content
> - tt_address
> - fe_users
> 
> I have updated the reference index.
> 
> Anyone who knows what to be done?
>

You also need to update the database-structure.

First backup your database.

Then login to the install-tool, select "Database Analyser".
Scroll down to "Update required tables" and click the "COMPARE"-link. 
Now accept all changes proposed.
Clear cache from backend.

Now it should be ready.

/Daniel