这个问题一般是 Adaptive card 中添加的 API 请求返回错误或超时导致的。解决方式是在请求 API 之前先检查网络连接是否正常，若正常则发起请求。若请求超时或返回错误，则显示相应的错误信息，例如：“网络请求超时”、“请求失败，请稍后再试”等。代码示例：

{
    "type": "AdaptiveCard",
    "version": "1.0",
    "body": [
        {
            "type": "TextBlock",
            "text": "Sample Adaptive Card"
        },
        {
            "type": "Input.Text",
            "id": "url",
            "placeholder": "请输入 URL",
            "validation": {
                "necessity": "required",
                "errorMessage": "URL 不能为空"
            }
        },
        {
            "type": "ActionSet",
            "actions": [
                {
                    "type": "Action.Http",
                    "id": "getData",
                    "method": "GET",
                    "url": "${url}",
                    "title": "获取数据",
                    "headers": {
                        "User-Agent": "Mozilla/5.0",
                        "Accept": "application/json"
                    },
                    "style": "positive",
                    "body": {
                        "key1": "value1",
                        "key2": "value2"
                    },
                    "onSuccess": [
                        {
                            "type": "Action.ShowCard",
                            "title": "成功提示",
                            "card": {
                                "type": "AdaptiveCard",
                                "version": "1.0",
                                "body": [
                                    {
                                        "type": "TextBlock",
                                        "text": "请求成功"
                                    }
                                ]
                            }
                        }
                    ],
                    "onFailure": [
                        {
                            "type": "Action.ShowCard",
                            "title": "错误提示",
                            "card": {
                                "type": "AdaptiveCard",
                                "version": "1.0",
                                "body": [
                                    {
                                        "type": "TextBlock",
                                        "text": "网络请求失败"
                                    }
                                ]
                            }
                        }
                    ],
                    "onTimeout": [
                        {
                            "type": "Action.ShowCard",
                            "title": "错误提示",
                            "card": {
                                "type": "AdaptiveCard",
                                "version": "1.0",
                                "body": [
                                    {
                                        "type": "TextBlock",
                                        "text": "网络请求超时"
                                    }
                                ]
                            }
                        }
                    ]
                }
            ]
        }
    ],
    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json"
}