A problem has occurred with my XUL-based applications

Hi Experts,
A problem has occurred with my XUL-based applications. I have received an error message regarding the compatibility issue. But think the problem is not that.
How can I get my XULRunner?
Please help.

XULRunner
Error: Platform version '1.9.1.16' is not compatible with
minVersion > = 1.9.1.17
maxVersion < = 1.9.1.17
