diff --git a/src/main.rs b/src/main.rs
index 13ad09e..bc5afc2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -80,18 +80,18 @@ fn parse_config(conf: String, pool: &mut Vec<robot::Robot>) -> Result<world::Wor
             return Err("This line should be empty !");
         }
         let a = match lines.next() {
-            None => return Err("This line should be config !"),
+            None => return Err("This line should be the config !"),
             Some(raw) => raw,
         };
         if a.is_empty() {
-            return Err("The config line should be empty !");
+            return Err("Thi line should not be empty !");
         }
         let b = match lines.next() {
-            None => return Err("This line should be instruction !"),
+            None => return Err("This line should be the instruction !"),
             Some(raw) => raw,
         };
         if b.is_empty() {
-            return Err("The instruction line should be empty !");
+            return Err("Thi line should not be empty !");
         }
         println!("{}", a);
         println!("{}", b);