The instantiation is wh_nios.jtag_uart:
Info: wh_nios.jtag_uart: JTAG UART IP input clock need (sic) ...
The HDL builder looks for wh_nios_jtag_uart and it can't find it:
Error: jtag_uart: Failed to find module wh_nios_jtag_uart
Ohh, I believe it is a 19.1 issue. I will open an internal ticket to check this and get fixed ASAP. I recommend you to use the 18.1 as it is the most stable version and reliable.
Please accept our apology for this inconvenience.