Can not use grok 4 fast

[davyzhang]

Always get error:

onError: AI_APICallError: Invalid JSON response
at index.js:4658:7210
at async postToApi (index.js:4658:5851)
at async iRe.doGenerate (index.js:4658:16218)
at async fn (index.js:4648:40169)
at async index.js:4648:29605
at async _retryWithExponentialBackoff (index.js:4648:31785)
at async fn (index.js:4648:39287)
at async index.js:4648:29605
at async generateText (index.js:4648:38513)
at async callLLMWithPrompt (index.js:4682:3739)