error message rather than panic

src/main.rs

@@ -108,8 +108,20 @@ fn main() {
         *v = args.verbose;
     }
 
-    let rom: ROM = ROM::load(fs::read(args.rom).expect("Could not load ROM"));
+    let rom: ROM = match fs::read(args.rom) {
-    let bootrom: Vec<u8> = fs::read(args.bootrom).expect("Could not load BootROM");
+        Ok(data) => ROM::load(data),
+        Err(e) => {
+            println!("Error reading ROM: {}", e.to_string());
+            return;
+        }
+    };
+    let bootrom: Vec<u8> = match fs::read(args.bootrom) {
+        Ok(data) => data,
+        Err(e) => {
+            println!("Error reading bootROM: {}", e.to_string());
+            return;
+        }
+    };
 
     let mut window = Window::new(
         format!("{}", rom.get_title()).as_str(),