diff --git a/src/lib.rs b/src/lib.rs
index ea3a708..ad76f18 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -618,9 +618,9 @@ impl MessageBehavior for VmcExtMidiNote {
             args,
         };
     }
-    fn from_osc_message(msg: OscMessage) -> Result<Self, String> {
+    fn from_osc_message(msg: OscMessage) -> Result<Self, FromMessageErr> {
         if msg.args.len() != 4 {
-            return Err(String::from("arg count invalid"));
+            return Err(FromMessageErr::ArgCount(ArgCountErr { expected_in: vec![4], actual: msg.args.len(), addr:  msg.addr}));
         }
         let active: bool;
         let channel: i32;
@@ -633,22 +633,22 @@ impl MessageBehavior for VmcExtMidiNote {
                 } else if i == 0 {
                     active = false;
                 } else {
-                    return Err(String::from("arg value invalid"));
+                    return Err(FromMessageErr::IntRange(IntRangeErr { expected_lower: 0, expected_upper: 1, actual: i, addr: msg.addr, arg_count: 0}));
                 }
             }
-            _ => return Err(String::from("arg type invalid")),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match msg.args[1] {
             OscType::Int(i) => channel = i,
-            _ => return Err(String::from("arg type invalid")),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         match msg.args[2] {
             OscType::Int(i) => note = i,
-            _ => return Err(String::from("arg type invalid")),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Int(0), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
         }
         match msg.args[3] {
             OscType::Float(f) => velocity = f,
-            _ => return Err(String::from("arg type invalid")),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::Float(0.0), actual: msg.args[3], addr: msg.addr, arg_count: 3})),
         }
         return Ok(VmcExtMidiNote {
             active,