after I use quartus II 9.0 to compile Title.v successfully, but I double click ALUArea::alu module turn on error below attached

[zhouxs1023]

after I use quartus II 9.0 to compile Title.v successfully, but I double click ALUArea::alu module turn on error as below:

if alu module have a bug ??

[Donggyu Kim]

It was fine with Vivado. ALUArea may not be friendly to FPGA since it's optimized for ASIC. Can you try ALUSimple instead?
https://github.com/ucb-bar/riscv-mini/blob/master/src/main/scala/Config.scala#L13