Whenever I test my code, I get the following error: Any help would be grealty appreciated.

+': nil can't be coerced into Fixnum (TypeError) from block in sum'
from each' from sum'
from `
'

# Sum Numbers
	def sum(numbers)
	if (numbers.any?) && (numbers.each { |i| i.class != String} )
		numbers.each {|total, i| total += i}
	else
		return 0
	end
	end