MC92N0 FusionInterfaceOpenEx

I've developed an .NET application for MC9090 and MC92N0. On MC92 I'm using EMDK for .NET V2.8. I've some trouble with "FusionInterfaceOpenEx" when I create the WLAN object (myWlan = new Symbol.Fusion.WLAN.WLAN(FusionAccessType.STATISTICS_MODE);). After the exception a warmboot is required. Any suggestions.