I tried several solutions and amongst them your solution; all passed fine "TESTS" and "ATTEMPT". I don't understand why you got that and I am unable to reproduce it. Save your solution, "RESET" the page try again.

I've changed it to def convert_fract(lst) copied verbtim from you snippet it's still producing

#<NoMethodError: undefined method expect' for main:Object Did you mean? exec> main.rb:15:in block (2 levels) in '
/runner/frameworks/ruby/cw-2.rb:180:in wrap_error' /runner/frameworks/ruby/cw-2.rb:72:in it'
/runner/frameworks/ruby/cw-2.rb:206:in it' main.rb:14:in block in '
/runner/frameworks/ruby/cw-2.rb:55:in block in describe' /runner/frameworks/ruby/cw-2.rb:46:in measure'
/runner/frameworks/ruby/cw-2.rb:51:in describe' /runner/frameworks/ruby/cw-2.rb:202:in describe'
main.rb:13:in `'

When going through ATTEMPT!

The template solution is:

def convert_fracts(lst)
  # your code
end

Function name in your solution is not the good one. Your solution is passing "ATTEMPT".

Issue with test for the attempt with ruby returning this in the logs #<NoMethodError: undefined method `expect' for main:Object
Did you mean? exec>

unable to complete kata because of this