1.8 Snpashots /scoreboard objectives add Stone stat.mineBlock.(Number instead of Name) Stone.

Basically, the '/scoreboard objectives add Stone """stat.mineBlock.(Number)""" stone' should be a Name, not a Number.
Example: If you want to add an objective where if you craft or mine a certain block it would have the stat.craftItem. <- And then the number instead of the Name, so if you want it to be "stat.mineBlock.stone" it doesn't work.