merge ot with rask

src/errors.rs

@@ -4,4 +4,7 @@ use failure::Fail;
 pub enum Error {
     #[fail(display = "Task Database Error: {}", _0)]
     DBError(String),
+
+    #[fail(display = "TDB2 Error: {}", _0)]
+    TDB2Error(String),
 }