Error: Response status is 400

[lightningcookies]

Hello! I'm quite new to API-200. I imported API endpoints via an openapi.json from an API provider. I Can't seem to get it to work using https://app.api200.co/specification . Maybe I'm making an easy mistake? There's just not much to be made from the error message. Here's the error:

{
"error": "Request failed with status code 400",
"details": "\n\n \n <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">\n <title>Error 400 (Bad Request)!!1</title>\n <style>\n {margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px} > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/branding/googlelogo/1x/googlelogo_color_150x54dp.png) no-repeat;margin-left:-5px}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) 0}}@media only screen and (-webkit-min-device-pixel-ratio:2){#logo{background:url(//www.google.com/images/branding/googlelogo/2x/googlelogo_color_150x54dp.png) no-repeat;-webkit-background-size:100% 100%}}#logo{display:inline-block;height:54px;width:150px}\n </style>\n \n

400. That’s an error.\n

Your client has issued a malformed or illegal request. That’s all we know.\n",
"api200": "This is not API200 error. It occurred in your API. Check details"
}

[rangoku]

It looks like the request body or parameters are incorrect. Are you sure you called it the right way? Maybe you could specify the URL / payload of the request?