Error (10476): VHDL error at .vhd(88): type of identifier "fboutclk" does not agree with its usage as "std_ulogic" type

Due to a problem with the Arria® V Transceiver PLL Intel® FPGA IP core in Intel® Quartus® Prime Standard Edition version 18.1 software, you may observe error similar to above during Analysis & Elaboration compilation if the IP variation file type is VHDL.

Change the following in the <ip_instance_name> .vhd: 

From  

fboutclk(0)        => fboutclk, 

hclk(0)            => hclk, 

To 

fboutclk(0)        => fboutclk(0), 

hclk(0)            => hclk(0),

This problem is fixed starting with the Intel® Quartus® Prime Standard Edition software version 19.1.