ID:21109 PCI Express hard IP block "<name>" is either not connected to, or is connected to an improperly configured GXB block on channel number <number>

CAUSE: The specified PCI Express hard IP block is either not connected to, or is connected to an improperly configured gigabit transceiver block (GXB) channel.

ACTION: Rerun the PCI Express Compiler. Otherwise, modify the design to properly connect and configure the GXB channels, so that it will function with the PCI Express hard IP block.