[Plugin: NextGEN Gallery] CSS conflict with 1.6.1 – help please!

Hi, I have updated NGG with the automatic options like other times I did and it worked fine. Then I tried to copy my own CSS style like the other times. Then I got this:

Warning: fopen(/www/docs/carlosfumagalli.com.ar/public_html/taller/wp-content/plugins/nextgen-gallery/css/) [function.fopen]: failed to open stream: Is a directory in /www/docs/carlosfumagalli.com.ar/public_html/taller/wp-content/plugins/nextgen-gallery/admin/style.php on line 48

Warning: fwrite(): supplied argument is not a valid stream resource in /www/docs/carlosfumagalli.com.ar/public_html/taller/wp-content/plugins/nextgen-gallery/admin/style.php on line 49

Warning: fclose(): supplied argument is not a valid stream resource in /www/docs/carlosfumagalli.com.ar/public_html/taller/wp-content/plugins/nextgen-gallery/admin/style.php on line 51

Oops, no such file exists! Double check the name and try again, merci.

I dont understand what I need verify,

But the great trouble is that a strange thing was happend: in the NGG style sheet appears the Style sheet of my theme!
If try to copy NGG style sheet (mine or default) I got the error message I copied above.
The style of my theme is broken now, if I deactivate NGG, the normal CSS of my theme becomes to work.

The theme is andreas ciberpress09.
You can see the site here.

Any help is appreciated!