Sorted:

I have windows xp I cant send e-mails or open my inbox?-Collection of common programming errors

Tank_auth set_value() undefined on custom login page-Collection of common programming errors

NoMethodError in AuthenticationsController#create undefined method `RandomString' for String:Class-Collection of common programming errors

Local variable undefined in respond_to json block-Collection of common programming errors

What type of behaviour is this?-Collection of common programming errors

Why are these Ruby method calls not equivalent?-Collection of common programming errors

Suppressing Linking Errors in G++ 3.4.6-Collection of common programming errors

C++, using #if TRUE conditional directive-Collection of common programming errors

uploading and import csv to rails-Collection of common programming errors

Linker error : undefined reference to symbol 'glOrtho'-Collection of common programming errors