[gem5-users] scons error:invalid use of incomplete type 'class System'

[yangyuqing--- via gem5-users]

I use gem5 20 on ubuntu 20.04.
I try to add some new features to gem5, but I do not damage class system. When 
I run scons, errors occurs like following:
In file included from /usr/include/c++/9/cassert:44,
                 from build/X86/mem/cache/write_queue_entry.hh:49,
                 from build/X86/mem/cache/write_queue.hh:50,
                 from build/X86/mem/cache/base.hh:64,
                 from build/X86/mem/cache/cache.hh:53,
                 from build/X86/cpu/base.hh:65,
                 from build/X86/sim/system.hh:55,
                 from build/X86/arch/x86/fs_workload.cc:48:
build/X86/mem/cache/base.hh: In member function 'void 
BaseCache::incMissCount(PacketPtr)':
build/X86/mem/cache/base.hh:1224:48: error: invalid use of incomplete type 
'class System'
 1224 |         assert(pkt->req->requestorId() < system->maxRequestors());
      |                                                ^~
In file included from build/X86/cpu/thread_context.hh:54,
                 from build/X86/arch/x86/fs_workload.hh:47,
                 from build/X86/arch/x86/fs_workload.cc:39:
build/X86/cpu/pc_event.hh:39:7: note: forward declaration of 'class System'
   39 | class System;
      |       ^~~~~~
In file included from /usr/include/c++/9/cassert:44,
                 from build/X86/mem/cache/write_queue_entry.hh:49,
                 from build/X86/mem/cache/write_queue.hh:50,
                 from build/X86/mem/cache/base.hh:64,
                 from build/X86/mem/cache/cache.hh:53,
                 from build/X86/cpu/base.hh:65,
                 from build/X86/sim/system.hh:55,
                 from build/X86/arch/x86/fs_workload.cc:48:
build/X86/mem/cache/base.hh: In member function 'void 
BaseCache::incHitCount(PacketPtr)':
build/X86/mem/cache/base.hh:1235:48: error: invalid use of incomplete type 
'class System'
 1235 |         assert(pkt->req->requestorId() < system->maxRequestors());
      |                                                ^~
In file included from build/X86/cpu/thread_context.hh:54,
                 from build/X86/arch/x86/fs_workload.hh:47,
                 from build/X86/arch/x86/fs_workload.cc:39:
build/X86/cpu/pc_event.hh:39:7: note: forward declaration of 'class System'
   39 | class System;
      |       ^~~~~~
 [     CXX] X86/arch/x86/insts/static_inst.cc -> .o
scons: *** [build/X86/arch/x86/fs_workload.o] Error 1
scons: building terminated because of errors.

I do not know what is wrong?
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