when i try compiling this codehttps://github.com/PeterBorah/ethereum-powerball/
../serpent/serpent compile contracts/lotto.se
i get this result
Error (file "contracts/lotto.se", line 72, char 74): Invalid call: (. (. self config) rng_address).random_numbers
libc++abi.dylib: terminating with uncaught exception of type std::__1::basic_string, std::__1::allocator >
anyone have any advice on what is going on?