multiple misfire on 2003 Nissan Altima

This is the only thing that came up on computer for my Altima. What could this mean? My car will crank but not start.

Asked by for the 2003 Nissan Altima
Camshaft position sensor and crankshaft position sensor one of this sensor could be
Before changing this two sensor
Have the computer scan first
And reply back with a codes