Error connecting ECU

[rschut]

Hi all,

I have got a Peugeot 206 on which I have installed a VEMS PnP. When i try to connect it to my laptop using VemsTune it shows an error and the connection cannot be made.

I have the ECU connected through a serial to usb adapter, running a laptop with Windows 8.
Is there an obvious problem which I can try to solve to get rid of this issue?

Thanks in advance,
Rschut