Hello @myilmaz,
The USRP 2901 is meant to be programmed only from the Host Interface using NI-USRP. As a result, there is no support from National Instruments to program the FPGA of the USRP 2901 using LabVIEW FPGA or LabVIEW Communications.
NI-USRP RIO devices allow you to program the FPGA using NI-USRP with LabVIEW Communications and LabVIEW FPGA.
Another option is to use the UHD driver and B210 examples from Ettus Research.
Regards,