A problem:TypeError: __init__() takes exactly 1 argument (2 given)

[PeterLiudong]

I got a problem when connecting gem5 and Dramsim3

File "configs/example/cmp.py", line 81, in <module>
system.cpu[i].workload = process[i]
File "/home/mahmood/gem5/src/python/m5/SimObject.py", line 627, in __setattr__
value = param.convert(value)
File "/home/mahmood/gem5/src/python/m5/params.py", line 236, in convert
tmp_list = [ ParamDesc.convert(self, value) ]
File "/home/mahmood/gem5/src/python/m5/params.py", line 159, in convert
return self.ptype(value)
TypeError: __init__() takes exactly 1 argument (2 given)
Error setting param MemCtrl.dram to <orphan DRAMsim3>

Do you know how to solve it?