Some customers are using Google Docs Viewer to view their Documents Online, however, Google Docs Viewer is often throw following error,
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Sorry, it took too long to find the document at the original source. Please try again later.
You can also try to download the original document by clicking here.
After this problem is appear, you can press F5 to refresh current web page, you will see document in Google Docs Viewer again, however, this is indeed a big trouble to your customers, you can't ask all of your customers to press F5 frequently.
There is lots of customers who encounter this problem, e.g.,
http://stackoverflow.com/questions/17360315/google-docs-viewer-file-request-timeout
http://wordpress.org/support/topic/plugin-google-doc-embedder-remove-error-message
http://wordpress.org/support/topic/unable-to-find-document-at-original-source
and more...
If you wish avoid this problem completely, we suggest you may use VeryPDF Docs Viewer to replace Google Docs Viewer, VeryPDF Docs Viewer has powerful and more functions than Google Docs Viewer, it is support 20+ formats now, we are planning to support more than 300+ formats in the future.
You can upload, convert and get iframe code for a document from following web pages easily,
Free Online Document Viewer (Flash & HTML5 Paper Viewer)
https://www.verypdf.com/online/free-view-document-online.php
Free Online Document Sharing (Flash & HTML5 Document Sharing)
https://www.verypdf.com/online/free-online-document-sharing.php
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See Also: