Error while account_activation


#1

Error:
UserMailerTest#test_account_activation:
ArgumentError: wrong number of arguments (given 0, expected 1)
app/mailers/user_mailer.rb:8:in account_activation' test/mailers/user_mailer_test.rb:6:inblock in class:UserMailerTest’
im learning ror by micheal hartl on the chapter 11