Sometimes you come across a page in SharePoint or Office 365 which partially loads and then gives you an error message or when you try to edit the page, you just can’t. This can come as there might be a faulty web part on that page preventing it from loading. Even if it loaded correctly before it can become corrupted due to many reasons.
There is a simple trick to get rid of the web part error so the page can load and you can investigate what caused the error and fix it. In a lot of cases you’re lucky the error message might provide a link directly to the web part maintenance page but in some cases it’s not. If it’s not provided to you then you just add the following text to the end of the URL (?contents=1) and a web part maintenance page will be loaded.
Example: https://awesome.domain.com/sites/sitepages/coolpages.aspx?contents=1
Just don’t forget to copy the Correlation ID and note the time for when you investigate the error in the SharePoint ULS logs.