Getting this error while editing a word document with Office web app 2013, but am able to edit and save Excel sheets. My documents are on SharePoint 2013 environment.
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I was facing this problem because the below property was set to TRUE on SharePoint 2013 Working Web Application.
$My_SITE.WebApplication.DisableCoauthoring = $true;
After setting this property to FALSE, the Word web app started working for Word Documents
$My_SITE.WebApplication.DisableCoauthoring = $false;