An error has occured while injecting!

Every time i try to inject new file i get an error message that says

An error has occured while injecting!
If you see a developer . tell him this:

No se puede realizar la solicitud por un error del dispositivo de E/S.

I’m new in this kind of things… a real rooky

I don’t remember any of the developers speaking Spanish.

Is E/S the same as I/O in English?