i have just tryed to unistall the plugins
SecurityInfo and VisitorGenerator but i can't unistall them i got an error:
It is the same error as this here: https://github.com/piwik/piwik/issues/4801
This looks like a very old version of the VisitorGenerator.
I think there might be 2 ways to fix this:
1) Update VisitorGenerator to the latest version and then uninstall it
2) Remove it manually by reming the directory
plugins/VisitorGenerator and then in
config/config.ini.php you may want to remove the line
Plugins = "VisitorGenerator" and
PluginsInstalled = "VisitorGenerator". The lines might not exist, in this case you can simply ignore it.
Same procedure for SecurityInfo.
Let me know if it worked