Possible reason: Failed to call the cllipboard.
Scenario 1: Due to the functional limitations of Office 2007, some resources will report this error.
Solution 1: Please use higher version of Office (2013 and above) or WPS Office.
Scenario 2: Only few resources have been reported error. It might because of the cache issue.
Solution 2: iSlide > Settings > General > Clear Cache
Prev Page The log shows “The remote server returned an error: (502) Bad Gateway.”