iberr = 2[0x2] when using ibwrt() using NI GPIB-USB-HS

I am trying to communicate with an instrument using the gpib library in CVI. I can see and communicate with this instrument in MAX without problems. The instrument is connected to a USB port of the PC using the NI GPIB-USB-HS.  After I create the device using ibdev() when I try to write a command using ibwrt I obtain the following error: Function ibwrt(). iberr == 2[2x02]. Do I need to do something else to being able to communicate with the instrument? Has it something to do with the fact that I am using the NI GPIB-USB-HS adapter? 

Thanks in advance,

Manuel