Error 422 on API Call

I get the error code 422 as response, its not mentioned in the Documentation. What is the problem here? thanks

try to call this api https://docs.tavily.com/docs/tavily-api/rest_api

{
"detail": [
{
"type": "model_attributes_type",
"loc": [
"body"
],
"msg": "Input should be a valid dictionary or object to extract fields from",
"input": "api_key=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&query=Wie+macht+man+einen+Kuchenbasar%3F&include_domains=www.gutes-wissen.org%2C+web.fundraiser-magazin.de&max_results=3",
"url": "https://errors.pydantic.dev/2.6/v/model_attributes_type"
}
],
"VF_STATUS_CODE": 422,
"VF_HEADERS": {
"connection": "close",
"content-length": "377",
"content-type": "application/json",
"date": "Tue, 23 Apr 2024 10:48:01 GMT",
"server": "nginx"
}
}