add new plugins..

What were you doing when you got the error? Can you link to your site?

Can you install themes from WordPress.ORG?

Where is your site hosted?

Site URL?

Have you tried deactivating any existing plugins?

You just gave access to your site to anyone on the internet – and it’s been up for an hour – which means it’s now cached by many search engines. You need to change those immediately.

I also don’t know what you mean by

search is don’t work this is the problem i think

Is biz.net your hosting company? or is that biznet.net?