When i try to access the item, this error happens.

Notice: Undefined property: stdClass::$image in /var/www/html/components/com_k2/helpers/utilities.php on line 187

:( Anyone have a solution ?

Joomla! 3.4.3 Stable [ Ember ] 2-July-2015 16:00 GMT
php 5.4.16
K2 v2.6.9
Mysql 5.6.25
Server Apache/2.4.6 (CentOS) PHP/5.4.16

This is not an actual error, it will not affect your site's functionality.
Disable error reporting from your site's global configuration to get rid of this.

Not true, the item really not show anything. Already create a menu k2 item and not show, category link not show , and simple news, not show.

check this links

direct to the item > ec2-54-207-118-41.sa-east-1.compute.amazonaws.com/index.php/home-page/noticias/item/4399-professores-receberao-o-dinheiro-dos-dias-parados-amanha

direct to the category > ec2-54-207-118-41.sa-east-1.compute.amazonaws.com/index.php/home-page/noticias

Here you can see the home, and some itens, but when you click ... not show anything ec2-54-207-118-41.sa-east-1.compute.amazonaws.com/index.php

I can see some markup being printed.
Can you double your category's setting to see if you have accidentally hidden these elements?

Also are you using any 3rd party K2 plugins?

I created a new categorie, and a new item for this new categorie and worked !
But the others categories and itens still not work.

I imported from other server , K2 v2.6.7 using the k2 importer (www.joomlaworks.net/forum/k2-en/16491-tool-for-importing-exporting-items-to-from-k2?limitstart=0)

What u think has happen ?

My bet would be that something went wrong during the import.
I would update the other site to K2 2.6.9 and re-import these items.

i will try do it now, post results soon

i removed all categories and itens before i import again.
I update the original website for latest k2 , exported and upload in the clean new website
cleaned cache

erro still happens :(
Notice: Undefined property: stdClass::$image in /var/www/html/components/com_k2/helpers/utilities.php on line 187

without " show error " i cant see anything ...

ec2-54-207-118-41.sa-east-1.compute.amazonaws.com/index.php/component/k2/item/6384-plano-municipal-aprovado-em-1-votacao

I can show in home, but if u click in a news, nothing show
check home : ec2-54-207-118-41.sa-east-1.compute.amazonaws.com/

any possible solution ?