Python Jupyter笔记本JSON无效

我已经安装了Anaconda3，正在使用一个名为“myenv”的环境。在那个环境中，我安装了ipywidgets

conda install --name myenv -c conda-forge ipywidgets

我可以看到ipywidgets安装在这个环境中

ipywidgets                7.1.2                    py36_0    conda-forge

但是，当我打开笔记本时，每次都会出现以下错误：

Notebook validation failed: 'execution_count' is a required property:
{
 "data": {
  "text/html": "<p>Failed to display Jupyter Widget of type <code>HBox</code>.</p>\n<p>\n  If you're reading this message in the Jupyter Notebook or JupyterLab Notebook, it may mean\n  that the widgets JavaScript is still loading. If this message persists, it\n  likely means that the widgets JavaScript library is either not installed or\n  not enabled. See the <a href=\"https://ipywidgets.readthedocs.io/en/stable/user_install.html\">Jupyter\n  Widgets Documentation</a> for setup instructions.\n</p>\n<p>\n  If you're reading this message in another frontend (for example, a static\n  rendering on GitHub or <a href=\"https://nbviewer.jupyter.org/\">NBViewer</a>),\n  it may mean that your frontend doesn't currently support widgets.\n</p>\n",
  "text/plain": "HBox(children=(IntProgress(value=0, description='Epoch', max=2), HTML(value='')))"
 },
 "metadata": {},
 "output_type": "execute_result"
}

在控制台中：

Notebook JSON is invalid: 'execution_count' is a required property

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关于如何修复此问题的任何想法

请尝试内核->重新启动并全部运行，然后选择文件->保存并检查点