Did you cut all the moldy/ rotten stuff off before you planted them?
Did you use any rooting hormone?
The secret to starting cuttings is humidity. The cutting has no roots, so in the usual way of things it would just die, because it has no way to uptake water and nutrients. If you keep it in a very humid environment out of direct sunlight, you give it its best shot at growing some roots in time to save it. A 2 liter soda bottle with the bottom cut off makes a decent humidity dome. Water the cutting well and put it under the dome.
But I don't know what the chances are, it was a very sick plant to start with.