Unsubscribe link not working in one of my instances

[samhast]

I have two instances of phplist on ONE server. two DB's, two installations,...

version = 3.0.10

on one of my instances, I have a strange situation.. everything is ok, but when I click on the unsubscribe link (http://domain.server.com/instance1/?p=u ... 291f6379af):
Error: please make sure that index.php is your default document for a directory

I deleted the index.html in my folder, but still I get the error..

In my second instance, I have no problems.....

when I go to http://domain.server.com/instance1/?p=unsubscribe directly, there are 0 problems.. I see the unsubscribe page perfect... So when I click the unsubscribe link in a mailing, I have the error!

Please advise...

[samhast]

I think it's solved. I just reinitialize the instance with problems, and now everything is ok..