Error(14566): The Fitter cannot place 1 periphery component(s) due to conflicts with existing constraints (1 HSSI_RX_CHANNEL_CLUSTER(s)).
Error(175001): The Fitter cannot place 1 HSSI_RX_CHANNEL_CLUSTER, which is within Generic Component fam_system_pcie_avmm_m.
Error(16234): No legal location could be found out of 1 considered location(s). Reasons why each location could not be used are summarized below:
Error(20196): Location(s) already occupied and the components cannot be merged. (1 location affected)
As I understand it, you observe some issue with Fitter placement. By merely looking at the error messages, it seems like your design has some placement violation. It may be due to limited resource or placement rule violation. To facilitate further debugging, would you mind to further elaborate on the following:
Please let me know if there is any concern. Thank you.