t_wの輪郭

error[E0782]: trait objects must include the `dyn` keyword 
  --> src\main.rs:26:42
   |
26 | fn run(config: Config) -> Result<(), Box<Error>> {    
   |                                          ^^^^^        
   |
help: add `dyn` keyword before this trait
   |
26 | fn run(config: Config) -> Result<(), Box<dyn Error>> {
   |                                          +++