Made MTTError a proper Error structure.

src/lib.rs

@@ -18,7 +18,7 @@ use queue::{
 use std::sync::mpsc::{channel, Receiver};
 use uuid::Uuid;
 
-pub use mtterror::MTTError;
+pub use mtterror::{ErrorID, MTTError};
 pub use name::{Name, NameType};
 
 #[cfg(test)]
@@ -118,7 +118,7 @@ impl MoreThanText {
         if name == "page" {
             Ok("something".to_string())
         } else {
-            Err(MTTError::DocumentNotFound(name.to_string()))
+            Err(MTTError::new(NameType::None, ErrorID::DocumentNotFound))
         }
     }
 }