From: ajay paswan <lists@...>
Date: 2012-11-22T21:07:35+09:00
Subject: CSV:mode must be 'r', 'rb', 'w', or 'wb'

Why this code is giving error:

code is:
CSV.open(filename, 'a') do |csv|
    csv<<[a,b,c,d]
end

Error is:

mode must be 'r', 'rb', 'w', or 'wb'

Note: I want to append.

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