Assistents API not reacting to user message

I created an assistent in: OpenAI Platform
And it is possible to send an user message but I can not get a respons also in the playground I can see the message but not the respons.

This is the respons:

“status”: 200,
“headers”: {
“date”: “Sat, 11 Nov 2023 14:53:26 GMT”,
“content-type”: “application/json”,
“transfer-encoding”: “chunked”,
“connection”: “close”,
“openai-version”: “2020-10-01”,
“openai-organization”: “user-noejl8poqtotivxfqce0q89z”,
“x-request-id”: “21b64dadf962475a64fe251a501b6a78”,
“openai-processing-ms”: “129”,
“strict-transport-security”: “max-age=15724800; includeSubDomains”,
“cf-cache-status”: “DYNAMIC”,
“set-cookie”: “__cf_bm=UrCKsl9i5IUgF9xRwQ5z2nDAqYGvxnFEOFhzoW6JofQ-1699714406-0-AZoGSuNbjv6dO6DtAJJxDU7CpylkmDzo023A0KIw19NkpFQa1oAc0PULMKM5dIVsFUlE0OIX997FKTwPnmungpY=; path=/; expires=Sat, 11-Nov-23 15:23:26 GMT;; HttpOnly; Secure; SameSite=None”,
“server”: “cloudflare”,
“cf-ray”: “82475d5f7a739bf5-FRA”,
“alt-svc”: “h3=":443"; ma=86400”
“body”: {
“id”: “msg_uriQSry7cCMy250BQwhpJpCi”,
“object”: “thread.message”,
“created_at”: 1699714406,
“thread_id”: “thread_m34Iaugedw63FfeIhFLmOItn”,
“role”: “user”,
“content”: [
“type”: “text”,
“text”: {
“value”: “What do you do?”,
“file_ids”: ,
“assistant_id”: null,
“run_id”: null,
“metadata”: {}

When I look in the playground I see this:

So how can I get the respons? from a API call to an assistent?
Thank you so much in advance.