Update app.py

app.py

@@ -90,7 +90,8 @@ class NanoBananaImageGenerator:
             for i in range(batch_count):
                 try:
                     print(f"Debug: Batch {i+1} - Attempting to call Gemini API.")
-                    response = GenerativeModel("gemini-2.5-flash-image-preview").generate_content(
+                    # Changed the model to a more stable 'gemini-pro-vision'
+                    response = GenerativeModel("gemini-pro-vision").generate_content(
                         contents=content_parts,
                         generation_config=generation_config
                     )