sample_callback_wrong.erl:16: The inferred return type of sample_callback_2/0 
         (42) has nothing in common with 
          atom(), which is the expected return type for the callback of the sample_behaviour behaviour
sample_callback_wrong.erl:17: The inferred return type of sample_callback_3/0 
         ('fair') has nothing in common with 
          'fail' | {'ok', 1..255}, which is the expected return type for the callback of the sample_behaviour behaviour
sample_callback_wrong.erl:18: The inferred return type of sample_callback_4/1 
         ('fail') has nothing in common with 
          'ok', which is the expected return type for the callback of the sample_behaviour behaviour
sample_callback_wrong.erl:20: The inferred return type of sample_callback_5/1 
         (string()) has nothing in common with 
          'fail' | 'ok', which is the expected return type for the callback of the sample_behaviour behaviour
sample_callback_wrong.erl:20: The inferred type for the 1st argument of sample_callback_5/1 (
          atom()) is not a supertype of 
          1..255, which is expected type for this argument in the callback of the sample_behaviour behaviour
sample_callback_wrong.erl:22: The inferred return type of sample_callback_6/3 
         ({'okk', number()}) has nothing in common with 
          'fail' | {'ok', 1..255}, which is the expected return type for the callback of the sample_behaviour behaviour
sample_callback_wrong.erl:22: The inferred type for the 3rd argument of sample_callback_6/3 (
          atom()) is not a supertype of 
          string(), which is expected type for this argument in the callback of the sample_behaviour behaviour
sample_callback_wrong.erl:4: Undefined callback function sample_callback_1/0 (behaviour sample_behaviour)