But how do I do this "Deactivate plugin admintools on database" if I don't have web access?  Are you asking me to use a command-line database client (like "mysql") and somehow figure out how to do this manually??

It would be better to know exactly why my installation has broken - i.e., where "Class MultiView" is supposed to be defined, and install/fix/replace this in the PHP scripts.

After "manual update" from piwigo 16.0 to 16.1 failed i Tried a total reinstall following the instructions but I get the same issue :

Fatal error: Uncaught Error: Class "MultiView" not found in /web/htdocs/www.fable.it/home/piwigo/plugins/AdminTools/main.inc.php:23 Stack trace

How can I solve it ? Thanks.

fablepd wrote:

After "manual update" from piwigo 16.0 to 16.1 failed i Tried a total reinstall following the instructions but I get the same issue :

Fatal error: Uncaught Error: Class "MultiView" not found in /web/htdocs/www.fable.it/home/piwigo/plugins/AdminTools/main.inc.php:23 Stack trace

How can I solve it ? Thanks.

Did you check file permissions as suggested by finlayson?

Make sure traversal permissions on directories are set as well, i.e. the 'x' bit on the AdminTools/include directory. (and 755 on files is unnecessary, they don't need the execute permission bit). Whether 755 was actually the right decision on your system is also unknown, it depends on if the user the web server runs as also owns the files, and likely the 'other' users don't need access at all. If so, then this

chmod -R a-x,u=rwX,g=rX,o= piwigo/
chmod ug+x piwigo/tools/*.{pl,sh}

sets 750 on directories and 640 on files (except piwigo/tools/*.{pl,sh} where also the x bit is set for 750). Replace piwigo/ with the actual directory of your Piwigo installation.

See also [Forum, post 180666 by erAck in topic 28678] Http Error 500.