Chart report get error after upgrade Cognos 8.3 fix pack 4 and hot site

[cogadmin]

I have an operational dashboard running fine before the upgrade. After upgrade, when I run this report, I got error: QFS-ERR-0126 A text child node is not expected. Any idea? I don't have problem with my other reports (which are list reports and simple chart reports).

[cogadmin]

I called cognos support about this problem. At first they said a hot site will fix this problem. Than they asked for the report spec, after they modified the report, it running fine now. It looks like they just changed some properties to make the report to work.