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app.py

@@ -15,11 +15,11 @@ if not openai_api_key:
 openai.api_key = openai_api_key
 
 def improve_code(user_code, language):
-    if startup_error:
-        return f"Error: {startup_error}"
     """
     Sends the user code to OpenAI GPT model and asks for an improved version.
     """
+    if not openai_api_key:
+        return "Error: OpenAI API key not set. Please set the OPENAI_API_KEY environment variable."
     system_prompt = f"You are an expert {language} developer. Refactor and improve the following code. Keep the same functionality but make it cleaner, more efficient and well commented."
     messages = [
         {"role": "system", "content": system_prompt},