ruby on rails - undefined method `error_messages_for' for #<#:0x -

ruby on rails - undefined method `error_messages_for' for #<#<Class:0x3981390>:0x -

problem this:

undefined method `error_messages_for' #<#:0x3a4f700>

my english language rubbish, can help me solve problem? thanks

error messages for removed in rails 3. extracted plugin, don't remember plugin called it's in rails github repo. rails has changed massively since 1.0.

check error messages replacement.

ruby-on-rails ruby