want to ask something about vector engine

[icuuuuuuer]

I’m new to gem5,
I want to use branch benchmark's file "riscv_vector_engine.py"，but when I use command "scons build/RISCV/gem5.opt",it occurs an error

then I change to branch default ,it can run "scons build/RISCV/gem5.opt"，but it seems that I cannot copy "riscv_vector_engine.py" and use it directly, I want to ask if there is a config file like "riscv_vector_engine.py" in the default branch?