Marlin Delta Firmware Issue

Hey,

I keep on getting this error with ErikZalm's version of Marlin.

when I try and verify the code I get this error:

redefinition of 'float delta [3]'

Marlin_main.cpp:321: error: redefinition of 'float delta [3]'
Marlin_main.cpp:294: error: 'float delta [3]' previously defined here


Any help on how to fix this?

Thanks