Undefined method NoMethodError whaaat

Hey, I am a college student, I’m rewritting a psychology program from
Chipmunk basic to ruby, It was all going fine until I had to write the
scoring code. Basically what happens is a bunch of subroutines are
called randomly and then the answers are stored in a global variable
$scores ( which is initialized via $score = Array.new(6) {Array.new(3)
{0}} ). Usually I get about a few in, usually the second falsecat (the
code I posted on paste bin along with the scoring subroutine) I get an
error message:
exp.rb:93:in scoring': undefined method[]’ for nil:NilClass
(NoMethodError)
from exp.rb:105:in falsecatsub' from exp.rb:177 from exp.rb:173:ineach’
from exp.rb:173

But I have no idea what it means! I thought maybe my numbering variable
was broken and returning nothing hence the [] or that time had a naming
conflict but I tried all that and… nothing. Here is the code!
http://pastebin.com/yMNbTyVF Have fun, and thanks!

El 22/09/2011 23:50, “Roland S.” [email protected] escribi:

(NoMethodError)
from exp.rb:105:in falsecatsub' from exp.rb:177 from exp.rb:173:ineach’
from exp.rb:173

But I have no idea what it means! I thought maybe my numbering variable
was broken and returning nothing hence the [] or that time had a naming
conflict but I tried all that and… nothing. Here is the code!
http://pastebin.com/yMNbTyVF Have fun, and thanks!

What that error means is that you are calling method [] on nil. Inside
scoring the only references to [] are $score[n][] so that means that
either
$score is nil or that it doesn’t have any element at position n. You
could
try to put this line

p $score

at the beginning of the scoring method to make sure what you have there.

Jesus.

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