Clock problem while running all the 6 channels of XEM8320 board using LTC226x-14 bit ADC

I am trying to operate all the 6 channels(PORT-A, B and C) of XEM8320 board at a time. I was able to run 4 channels (A & B) but as soon as I incorporated PORT-C, it is showing the error: "No valid object(s) found for ‘-group[get_clocks-include_generated_clocks adc_dco_p_pC]’. This error is indicated in constraint file. For your reference, I’m adding the constraint file I wrote for all the 6 channels.

ConstraintFile_6Channels.pdf (107.9 KB)