It looks like there is something wrong with the config file, but according to the error message you're trying to load the config into a pretty old version (6.0.9 as well?).
We can only support the newest releases, with the latest one being v7.1.2, so I recommend trying the latest version.
Please note that the software is no longer freeware, so if you replace your free version with the latest one, it will be in trial mode. On the other hand, we have made significant improvements since 6.0.9, so you may want to consider purchasing a licence to gain access to the new features.