Error Invalid operation

When I try to run the script, I get the following notification:

```
Gemini error: Invalid operation: The
`response.parts` quick accessor requires a
single candidate, but but
`response.candidates` is empty.
This appears to be caused by a blocked
prompt, see `response.prompt_feedback`:
block_reason: PROHIBITED_CONTENT
```

Can this be fixed? And what is this error?