I am getting this error while opening a document.
How to resolve the error?
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There can be many reasons behind this error
To troubleshoot the issue, check things below:
Add the SharePoint site into trusted sites and check the result.
Repair the office application. Go to control panel->uninstall a program->right click Microsoft office 2010->change->repair.
Check if there is some firewall policy blocking the traffic from SharePoint site. There is a similar post below: