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Before we try anything, lets try a simple repair first.
Open your finder ( magnifying glass ) type in disk utility, and launch the disk utility application.
On the left side of the disk utility window, click your mac hd, then at the lower right hand side, click repair permissions. Once it says permissions repair complete. Close quark, reopen it. And try to use the flightcheck plugin again. If the issue still occurs....
There could be an issue with the markzware plugin, and it may need to be reinstalled, or updated.
This could also be an issue with your quark preference files.. And we may need to delete your quark plist files and restart your mac, and then try again.
The error you listed does point at there possibly being a fault within the file itself. You may want to try editing or changing any bulleting or numbering your using within the file, as it doesnt seem the flightcheck plugin is recognizing it. This link should help
However, if you get the same error on any file you flightcheck.. Then we may need to delete your quark plist files, and possibly reinstall the markzware plugin itself.
So let me know if the above helps, and if it doesnt then youre welcome to respond and I will assist you further as needed.
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Senior Technician and Network Switching Systems Operator / Maintainer.