Typical messages and fixes:

• Please describe what you want. — the prompt box was empty.
• AI model ... is not a valid key — the AI model chosen in your Sprwt AI settings is not supported; pick one of the listed models (GROQ, GPT-4 family or Gemini family).
• AI provider returned no content / high demand — the provider (often Gemini) answered without content; try another model or try again later.
• The AI hit its output token cap before finishing — ask for a shorter or simpler layout.
• AI returned an unreadable response — rephrase with a more specific prompt.

Credits are only charged when a generation completes; check your balance in the pop-up.