diff --git a/src/lib.rs b/src/lib.rs
index 903718c..310ba9a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -980,25 +980,25 @@ impl MessageBehavior for VmcExtVrm {
             args,
         };
     }
-    fn from_osc_message(msg: OscMessage) -> Result<Self, String> {
+    fn from_osc_message(msg: OscMessage) -> Result<Self, FromMessageErr> {
         if msg.args.len() < 2 || msg.args.len() > 3 {
-            return Err(String::from("arg count invalid"));
+            return Err(FromMessageErr::ArgCount(ArgCountErr { expected_in: vec![2, 3], actual: msg.args.len(), addr: msg.addr}));
         }
         let path: String;
         let title: String;
         let mut hash: Option<String> = None;
         match &msg.args[0] {
             OscType::String(s) => path = s.to_owned(),
-            _ => return Err(String::from("arg type invalid")),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[0], addr: msg.addr, arg_count: 0})),
         }
         match &msg.args[1] {
             OscType::String(s) => title = s.to_owned(),
-            _ => return Err(String::from("arg type invalid")),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[1], addr: msg.addr, arg_count: 1})),
         }
         if msg.args.len() == 3 {
             match &msg.args[2] {
                 OscType::String(s) => hash = Some(s.to_owned()),
-                _ => return Err(String::from("arg type invalid")),
+            _ => return Err(FromMessageErr::ArgType(ArgTypeErr { expected: OscType::String(String::new()), actual: msg.args[2], addr: msg.addr, arg_count: 2})),
             }
         }
         return Ok(VmcExtVrm { path, title, hash });