Time executed in 0 seconds message

Hello

I'm using atahualpa theme to make a website. All things were working fine, until sometime today when my "recent posts plus" widget showed this message on the widget

Time executed in 0 seconds

right after the headline of the widget.

I've deleted the plugin and re-installed it, but this didn't fix the problem.

I've also tried different recent posts widgets, but i keep having the same problem with all of them.

All the other widgets work fine.

What seems to be the problem an how can i fix it?