The issue is caused by defective hardware or a mis-seated network module.
If the router is in boot loop mode and displays this error message, perform these steps:
Continue installing one network module at a time because the hardware is causing the issue. This should be done until the network module or chassis slot is isolated.
If the router does not go back into the boot loop mode after reinstalling all modules, the issue may be a mis-seated network module.
For more information, refer to these documents:
PCI bus parity error
After reboot or power cycle (and no other changes)
%ERR-1-GT64010: Fatal error