Syntax error after setting IPSEC VPN

[rich2010]

I receive this error when checking the filter load status. I tried configuring Mobile Clients option in VPN > IPSEC to allow remote users :

–---
There were error(s) loading the rules: /tmp/qwanRoot.rules:12: syntax error pfctl: Syntax error in config file: pf rules not loaded pfctl: load anchors - The line in question reads [12]: set skip on pfsync0
–---

Any ideas on what that means or how to resolve, restore a backed-up configuration is the only thing I can think ?

Thanks