SnappyHexMesh Failed!

[tstargazer]

I am confused about using SnappyHexMesh for meshing 4 buildings. I am using Butterfly,with BuleCFD-core 2017-2 in Windows 10 64bit.The blockmesh worked good.And the snappyhexmesh crashed in the process. Some settings wrong?Could you help me solve this question?

1. Solution exception:
   --> snappyHexMesh Failed!
   Generating stack trace…

Backtrace:

ZN10StackTraceC1Ev [0x705c1465+0x25]

	 module: C:\Program Files\blueCFD-Core-2017\ThirdParty-5.x\platforms\mingw_w64GccDPInt32\lib\libstack_trace.dll

ZN4Foam5error10printStackERNS_7OstreamE [0x2801c88+0x218]

	 module: C:\Program Files\blueCFD-Core-2017\OpenFOAM-5.x\platforms\mingw_w64GccDPInt32Opt\lib\libOpenFOAM.dll

ZN4Foam7sigQuit14sigQuitHandlerEi [0x2803c23+0x33]

	 module: C:\Program Files\blueCFD-Core-2017\OpenFOAM-5.x\platforms\mingw_w64GccDPInt32Opt\lib\libOpenFOAM.dll

_pxcptinfoptrs [0x7ff9a10fabcd+0xcd]

	 module: C:\Windows\System32\msvcrt.dll

CtrlRoutine [0x7ff99ea2ab73+0xc3]

	 module: C:\Windows\System32\KERNELBASE.dll

BaseThreadInitThunk [0x7ff9a0af74b4+0x14]

	 module: C:\Windows\System32\KERNEL32.DLL

RtlUserThreadStart [0x7ff9a12026a1+0x21]

	 module: C:\Windows\SYSTEM32\ntdll.dll

^C
test1117.zip