diff --git a/src/app/__main__.py b/src/app/__main__.py
index 04bc1d5..2e9559c 100644
--- a/src/app/__main__.py
+++ b/src/app/__main__.py
@@ -6,27 +6,31 @@ from app.interface import *
 
 
 if __name__ == "__main__":
-    # =====================
-    load_dotenv()
-    configs = AppConfig.load()
-    # =====================
-
-    chat = ChatManager()
-    gradio = chat.gradio_build_interface()
-    _app, local_url, share_url = gradio.launch(server_name="0.0.0.0", server_port=configs.port, quiet=True, prevent_thread_lock=True, share=configs.gradio_share)
-    logging.info(f"UPO AppAI Chat is running on {share_url or local_url}")
-
     try:
-        telegram = TelegramApp()
-        telegram.add_miniapp_url(share_url)
-        telegram.run()
-    except AssertionError as e:
+        # =====================
+        load_dotenv()
+        configs = AppConfig.load()
+        # =====================
+
+        chat = ChatManager()
+        gradio = chat.gradio_build_interface()
+        _app, local_url, share_url = gradio.launch(server_name="0.0.0.0", server_port=configs.port, quiet=True, prevent_thread_lock=True, share=configs.gradio_share)
+        logging.info(f"UPO AppAI Chat is running on {share_url or local_url}")
+
         try:
-            logging.warning(f"Telegram bot could not be started: {e}")
-            loop = asyncio.new_event_loop()
-            asyncio.set_event_loop(loop)
-            loop.run_forever()
-        except KeyboardInterrupt:
-            logging.info("Shutting down due to KeyboardInterrupt")
-    finally:
-        gradio.close()
+            telegram = TelegramApp()
+            telegram.add_miniapp_url(share_url)
+            telegram.run()
+        except AssertionError as e:
+            try:
+                logging.warning(f"Telegram bot could not be started: {e}")
+                loop = asyncio.new_event_loop()
+                asyncio.set_event_loop(loop)
+                loop.run_forever()
+            except KeyboardInterrupt:
+                logging.info("Shutting down due to KeyboardInterrupt")
+        finally:
+            gradio.close()
+
+    except Exception as e:
+        logging.error(f"Application failed to start: {e}")
diff --git a/src/app/configs.py b/src/app/configs.py
index 6402e73..255f435 100644
--- a/src/app/configs.py
+++ b/src/app/configs.py
@@ -152,9 +152,12 @@ class AgentsConfigs(BaseModel):
     def validate_defaults(self, configs: 'AppConfig') -> None:
         """
         Validate that the default models and strategy exist in the provided configurations.
+        If any default is not found, a ValueError is raised.
         Args:
             models: ModelsConfig instance containing all available models.
             strategies: list of Strategy instances containing all available strategies.
+        Raises:
+            ValueError if any default model or strategy is not found.
         """
         try:
             configs.get_strategy_by_name(self.strategy)