Problems after uninstall

I’ve installed this plugin.
probably due to I’ve also subscribe2 plugin installed, several mails was sent to my users to notify them of new pages created by this plugin, even if in the subscribe2 settings are not active email for new pages.
So I’ve uninstalled User Profile plugin.
Now when a user make login in the classical way, login fails: the login page is reloaded with no succes. If an user is already logged, he can’t logout (a wordpress error is shown).
Please give me support in fixing those errors