On my phantom 4 all the lights are red does anyone know why

Two rear means critical error.  Two front means hunkee doree

As in solid red and not flashing red ?

The front two are navigation lights, and are always red, makes it easier to see the orientation of the aircraft.

The rear two however are the aircraft status indicators, and if they are solid red then that is an indication of a critical error. If they are flashing red then that could have several meanings, one of which is that the battery charge might be low/critical.

bet the battery wasn't in all the way..seen that once..now I triple check.
cheers
D