Describe the bug

To Reproduce
Steps to reproduce the behavior:

1. put .env file into the current folder
2. run demogpt
3. goto the webpage and type name and description for the app and submit.
4. "please enter the openai api key"

Expected behavior
in the .env file I changed the "OPENAI_API_BASE" and specified the 'OPENAI_API_KEY', so when clicked on submit, it should directly call the llm