logging: improve error messages

Author: chmjkb

packages/react-native-executorch/common/rnexecutorch/models/llm/LLM.cpp

@@ -14,7 +14,8 @@ LLM::LLM(const std::string &modelSource, const std::string &tokenizerSource,
       callInvoker(callInvoker) {
   auto loadResult = runner->load();
   if (loadResult != Error::Ok) {
-    throw std::runtime_error("Failed to load LLM runner");
+    throw std::runtime_error("Failed to load LLM runner, error code: " +
+                             std::to_string(static_cast<int>(loadResult)));
   }
   memorySizeLowerBound =
       std::filesystem::file_size(std::filesystem::path(modelSource)) +
@@ -35,7 +36,7 @@ void LLM::generate(std::string input, std::shared_ptr<jsi::Function> callback) {
 
   auto error = runner->generate(input, nativeCallback, {}, false);
   if (error != executorch::runtime::Error::Ok) {
-    throw std::runtime_error("Failed to generate text, error: " +
+    throw std::runtime_error("Failed to generate text, error code: " +
                              std::to_string(static_cast<int>(error)));
   }
 }