Looks like the office server fails to convert the XHTML produced by the XWiki rendering to RTF. You could try to see what part of your wiki page is preventing the export, and if you have knowledge of XSLT you can try to adjust the XHTML produced by the XWiki rendering to please the office server using officeExport.xsl file from xwiki-platform-legacy-oldcore jar.
Thanks Marius getting back to me, I think I have norrowed it down to the images of the file, I tried looking in xwiki-platform-legacy-oldcore jar but I couldnt find file called officeExport.xsl
P.S.: RTF is an old format. Unless you are forced by your organization to use it, you should move to better formats (PDF, ODT).
I also get this error with ODT but not PDF is this odd as PDF works and ODT & RTF don't? -- View this message in context: http://xwiki.475771.n2.nabble.com/Can-t-Export-to-RTF-tp7583253p7583259.html Sent from the XWiki- Users mailing list archive at Nabble.com.