It looks like you are running the Test version of the ruleset code with the Live version of the FG client. Since the new ruleset code uses new APIs in FG v4.5.0, you'll need to be running both the FG test version for both application and rulesets.

If your versions are not matching up; make sure that the shortcut that you use to start FG is pointing to the same folder as the FG application folder in the FG Settings.