Have you been facing SharePoint Wiki page error in your Server site? If yes then here is a solution for the same. The error usually comes up while editing or accessing a Wiki page that you had created on your SharePoint site. The cause of its occurrence has been discussed with a resolution has been discussed in the following section.
In SharePoint we create library for documents, sites, and internal pages in those sites as well. Wiki page is a site which is designed intended for groups of users to help them capture as well as share their ideas quickly with everyone simply by creating pages and then linking them collectively. Once a Wiki page has been created other users can add contents to it from their end, edit existing content, or can even add up supporting links.
Rise of the Issue:
In the process of trying to access or edit any SharePoint Wiki page sometimes users end up facing SharePoint Wiki page error stating; "An unexpected error has occurred."
Probably the issue of Wiki edit error in SharePoint might have taken place because of a hack being placed in the Wiki page.
If a hack placed is the cause then you can try redeploying missing references. A cleanup might be required and probably you will be able to overcome the issue.
In case the issue persists and you are still facing SharePoint Wiki page error on accessing or editing it then there is a much severe problem associated to it.
A dependable solution in such case would be using a reliable commercial database recovery solution for SharePoint which has been built with the expertise to resolve corruption issue of SharePoint database and get back SharePoint wiki.