Update app.py

app.py

@@ -253,7 +253,13 @@ Follow this example structure:
         system_instruction=system_prompt
         )
 
-        response = await model.generate_content_async(messages)
+        try:
+            response = await model.generate_content_async(messages)
+        except Exception as e:
+            if "API key not valid" in str(e):
+                raise gr.Error("Invalid API key. Please provide a valid Gemini API key.")
+            else:
+                raise gr.Error(f"Failed to generate podcast script: {e}")
 
         print(f"Generated podcast script:\n{response.text}")
         
@@ -319,8 +325,7 @@ class TextExtractor:
         elif file_extension.lower() == '.txt':
             return await cls.extract_from_txt(file_path)
         else:
-            gr.Error(f"Unsupported file type: {file_extension}")
-            raise ValueError(f"Unsupported file type: {file_extension}")
+            raise gr.Error(f"Unsupported file type: {file_extension}")
 
 async def process_input(input_text: str, input_file, language: str, speaker1: str, speaker2: str, api_key: str = "") -> str:
     gr.Info("Starting podcast generation...")