It looks like you're using an older version of Quest Machine. You can either update to 1.2.9 and reimport the patch, or revert that file to the version of Quest Machine that you're using. If you're not using version control and can't import it from your Asset Store cache folder, let me know what version of Quest Machine you're using, and I'll send you the file.
If you already are using 1.2.9, let me know. I tested with the prerelease version 1.2.10. I may need to send you an additional file.