Reference clock initialization Reference Clock PLL failed to lock to internal source.

[Jshen1]

Hi,

I'm trying to use the rx_sample_to_file example code. I'm trying to change the reference output of the USRP x310 to 30.72 Mhz. This is the line of code I'm using

 Program Files\UHD\lib\uhd\examples\rx_samples_to_file.exe" --args master_clock_rate=184.32e6,system_ref_rate=11.52e6

I'm currently using an LFRX daughterboard and connecting to the USRP via ethernet and dongle.

However, when running this line of code I get this error 

Error: RuntimeError: Reference Clock PLL failed to lock to internal source.

What could be the issue here?