GEM5 integration call Error

[idealgao]

Hi All,

After clone the lastest repository, and strictly following step 1~6 to setup Ramulator2 into GEM5. Compile passed, Ramulator2 standalone test is Okay and GEM5 self-test case is Okay.
build/X86_BK/gem5.opt configs/deprecated/example/se.py --cmd=tests/test-progs/hello/bin/x86/linux/hello --cpu-type=TimingSimpleCPU --l1d_size=64kB --l1i_size=16kB --caches

But when GEM5 call Ramulator2 as ext-memory, the comes out errors below, is there any files I missed? Is there a sample for Step-6?
command line: build/X86_BK/gem5.opt configs/deprecated/example/se.py --cmd=tests/test-progs/hello/bin/x86/linux/hello --cpu-type=TimingSimpleCPU --l1d_size=64kB --l1i_size=16kB --caches --mem-type=Ramulator2

warn: The se.py script is deprecated. It will be removed in future releases of gem5.
AttributeError: object 'Ramulator2' has no attribute 'controller'
(C++ object is not yet constructed, so wrapped C++ methods are unavailable.)

At:
src/python/m5/SimObject.py(855): getattr
/home/idealgao/workshop/gem5/gem5/configs/common/MemConfig.py(243): config_mem
configs/deprecated/example/se.py(296):
src/python/m5/main.py(669): main