I had to migrate an old site from the 1.5 version of Joomla! to the last version. Like I'm a beginner and it looks complicated to make the update, I created a new site in Joomla 3 version and then import my data from the old site. Everything is on ionos and I used the click and install link that the site provides.
After some adjustments like going in Extensions > Manage > Database and fix the errors found by the system, I still have two errors in the administration panel saying this :
I can see it again when I try to go in Content > Articles with the error code 500 and it don't allow me to see the articles.Unknown column 'a.language' in 'on clause'
Unknown column 'a.featured' in 'field list'
Can anybody help me to resolve this ?
Thanks in advance