Sorted:

when redirect gives an error “undefined”-Collection of common programming errors

linker error: undefined reference to `vtable of QGLViewer’-Collection of common programming errors

jshint functions with dots in the name-Collection of common programming errors

Ruby-on-Rails: Devise custom failure app problem-Collection of common programming errors

Express, EJS, challenge with testing for undefined-Collection of common programming errors

Devise undefined method `email'-Collection of common programming errors

Can tan 90 degrees be calculated in a computer program?-Collection of common programming errors

devise undefined method `users_url' for RegistrationsController-Collection of common programming errors

TFS2010 with VS2012 workflow build process templates-Collection of common programming errors

BASH getopt command returns its own parameters instead of command line parameters-Collection of common programming errors