If the leve is of rank 15, it means that the actual craft for that leve is somewhere 15-20 (usually rank 18).
What exactly was the item you were asked to make, and did it show any training skill requirements?

Also as far as the crafting stats go, how did you add the stats, from whats shown in the stats window or manually?
You forgot to mention your mg craftsmanship, how high is it?

Also you mention a weapon (your referring to your tool i guess), what rank is it?

Answering these questions should help us figure out what your crafting problems are. ^^