Any prompt gives me: There was an error processing your request: An error occurred

Also please check if OpenAI works without bolt, just with a curl request:

curl https://api.openai.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_OPENAI_API_KEY" \
  -d '{
    "model": "gpt-4o",
    "max_tokens": 8192,
    "temperature": 0,
    "messages": [
      {
        "role": "user",
        "content": "Your prompt here"
      }
    ]
}'

Put in your api key.