Testfor command procuding error in 1.11 snapshots?
Due to changes in the way the 1.11 snapshots parse selector arguments, you now have to specify x=, y= and z= before your coordinates; the @a[#,#,#,#] shortcut no longer works unfortunately. For example:
/testfor @a[x=1117,y=20,z=507,r=1]