Scanner says injector 10.......I only have 8 injectors what does this mean? on 1997 Jeep Grand Cherokee

Check engine light scanned for codes and it said injector 10 failure.?..I have a v8

What's the code 'number'.? .... PO???
That's the problem there is no p code at all.
Yes that is a problem!! ... What exactly IS the problem.... Why are you concerned?.... Not running right, light on, what?