Ive had some email contact with Nick and he found out what the problem was.
It had nothing to do with the way i configured my FusionConfiguration.xml.
The problem was that my regional settings where set on dutch. And here in the Netherlands we use a , instead of a . for a decimal symbol.
Ive changed this in the regional settings and now everything is working fine.
For those who have the same problem bellow is a screenshot of what you need to change in your regional settings:
Thanks Fusion Control Centre