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There is a limit on the time taken to process individual pages. If you see this error it means one page has breached this limit. This may be because the page is particularly complex or it could indicate a problem with the server.
We have an alternative server called transdev.iceni.com. This server has a much higher time limit which will give your PDF a chance to process to completion.
Log in to transdev.iceni.com and try processing your PDF there. It is not wise to use this server for all your translations since it is slower and more often off-line since it is used for development.
If you need further assistance, get in touch with us by pressing next to the PDF in question.