Improve model architecture error message

crates/llm-base/src/loader.rs

@@ -338,7 +338,9 @@ pub enum LoadError {
     /// There is insufficient information to guess the model architecture from the provided file.
     ///
     /// A model architecture must be provided to load the model.
-    #[error("could not guess model architecture from {path:?}")]
+    #[error(
+        "could not guess model architecture from {path:?}. Please provide a model architecture."
+    )]
     MissingModelArchitecture {
         /// The path that failed.
         path: PathBuf,

crates/llm/src/lib.rs

@@ -149,7 +149,7 @@ macro_rules! define_models {
                     )*
 
                     _ => Err(UnsupportedModelArchitecture(format!(
-                        "{s} is not a supported model architecture"
+                        "{s} is not one of supported model architectures: {:?}", ModelArchitecture::ALL
                     ))),
                 }
             }