session_start() error

I have a brand new wordpress install running in my server and I’m getting this erros a lot in different places, from templates to plugins.

Warning: session_start() [function.session-start]: open(/var/chroot/home/content/k/l/o/klopez/tmp/sess_86a6f7ac25932e90e42be643d1025487, O_RDWR) failed: No such file or directory (2)

It’s not browser data.