[Jstylezzz]

Look at the checkpointID you gave to the toggle function. It is not the same as the one you created above it. The one you created is

Code:

CP[Area51]

And yet you use

Code:

Area51

inside the toggle function. Should be like this

Code:

CP[Area51] = CreateDynamicCP(215.4474,1822.8730,6.4141, 5, -1, -1, -1, 100);
TogglePlayerDynamicCP(playerid, CP[Area51], 1);

Always be sure to double check these things.