session_start error

[Anguz]

Fatal error: session_start(): Failed to initialize storage module: user (path: /tmp) in {path}/Sources/Load.php on line 1135

What does this error mean? I didn't find a tmp dir in the account and this only happened some times today in the morning, but usually doesn't. TIA.

[[Unknown]]

Possibly because of an earlier error, such as the session id containing invalid characters.

-[Unknown]

[Anguz]

I see, and how could that have happened? I mean so I fix it to prevent it from happening again.

[[Unknown]]

Someone messing around with something they shouldn't have.  I doubt it's anything you should fix.

-[Unknown]

[Anguz]

Okay, thank you.