Warning: is_readable() [function.is-readable]:

Greetings to all. I have a problem, I installed wp 4.0 and woocommerce 2.2.3, and I find that’s a warning, as indicated in the figure. This is the same warning appears on the site. Help please. Php version 5.2.17 is worth, if you put 5.4.30, it generally produces a 503 error.

Image

https://wordpress.org/plugins/woocommerce/