Added cache initialization.

src/morethantext/mod.rs

@@ -8,7 +8,7 @@ use async_std::{
     sync::{Arc, Mutex},
     task::{sleep, spawn},
 };
-use error::DBError;
+use error::{DBError, ErrorCode};
 use rand::{distributions::Alphanumeric, thread_rng, Rng};
 use std::{
     collections::HashMap,