An error occurs at stage 10

Help please! Running the set-up wizard as far as stage 9, but then when I proceed to stage 10 I get this instead:

'PHP WARNING [2] imagecreatefromstring() [<a href='http://php.net/manual/en/function.imagecreatefromstring.php'>function.imagecreatefromstring.php</a>]: gd-png: fatal libpng error: Read Error: truncated data in sources/themewizard.php on line 319'

What is happening and how do I overcome it please?

Thank you

Hi,

Is this the latest version (RC23)?
Because I don't think this error message is possible since RC9. We fixed it after an automated error mail came throguh with this error.

The likely underlying cause is a corrupt image file on disk, but newer RCs will tell you exactly what file that is.

If you are running an old version and don't want to upgrade, you can try replacing just sources/themewizard.php to get the new error message, or running the integrity checker within the upgrader.