After installing the K2 and integrate it with your plugins, it worked fine, but when I made a comment on the article I throw an error "1327 - Undeclared variable: 3a5"
Uninstall the K2
Try doing it with the native joomla and its plugin to join it to the time line.
Everything worked well, but when making a comment on the article, the error occurred again: "1327 - Undeclared variable: 3a5"
I already deleted the article and I can not correct the error.
You can see the error on my home page (I think) But surely if they enter the frontpage as an administrator, they can see it.