The ALT_LVDS_RX megafunction has been instantiated with a rx_cda_reset port, which is not supported by the Arria V and Cyclone V device families.
The error message states that the rx_cda_reset port does not exist. The rx_cda_reset port may have been removed to ease the reset recovery timing for the ALTLVDS_RX.
This issue affects the ALTLVDS_RX in version 12.0 of the Arria V and Cyclone V devices and forces the triple speed ethernet IP to be regenerated in version 12.1.
Regenerate the triple speed ethernet IP in version 12.1.
This issue will be fixed in a future version.