It looks like a Python 3.8.x vs 3.9.x issue. It looks as if you’re using Mu Q35 as your platform. Can you tell me what branch you’re on? - Bret From: Pandya, Shivanshi via groups.io Sent: Friday, April 9, 2021 1:52 PM To: devel@edk2.groups.io Subject: [EXTERNAL] [edk2-devel] Build Failed for QEMU35Pkg Hello, Build failed with following call trace build.py... INFO - : error C0DE: Unknown fatal error when processing [c:\bea\dfci\mu_tiano_platforms\Common\PRM\PrmPkg\Library\DxePrmModuleDiscoveryLib\DxePrmModuleDiscoveryLib.inf [X64, VS2017, DEBUG]] INFO - INFO - (Please send email to devel@edk2.groups.io for help, attaching following call stack trace!) INFO - INFO - (Python 3.9.0 on win32) Traceback (most recent call last): INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\build\build.py", line 2635, in Main INFO - MyBuild.Launch() INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\build\build.py", line 2430, in Launch INFO - self._MultiThreadBuildPlatform() INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\build\build.py", line 2238, in _MultiThreadBuildPlatform INFO - Wa, self.BuildModules = self.PerformAutoGen(BuildTarget,ToolChain) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\build\build.py", line 2112, in PerformAutoGen INFO - CmdListDict = self._GenFfsCmd(Wa.ArchList) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\build\build.py", line 2009, in _GenFfsCmd INFO - GenFfsDict = GenFds.GenFfsMakefile('', GlobalData.gFdfParser, self, ArchList, GlobalData) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\GenFds.py", line 541, in GenFfsMakefile INFO - FdObj.GenFd(Flag=True) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\Fd.py", line 131, in GenFd INFO - RegionObj.AddToBuffer (FdBuffer, self.BaseAddress, self.BlockSizeList, self.ErasePolarity, GenFdsGlobalVariable.ImageBinDict, self.DefineVarDict, Flag=Flag) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\Region.py", line 134, in AddToBuffer INFO - FvObj.AddToBuffer(FvBuffer, FvBaseAddress, BlockSize, BlockNum, ErasePolarity, Flag=Flag) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\Fv.py", line 127, in AddToBuffer INFO - FileName = FfsFile.GenFfs(MacroDict, FvParentAddr=BaseAddress, IsMakefile=Flag, FvName=self.UiFvName) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\FfsInfStatement.py", line 518, in GenFfs INFO - InputSectList, InputSectAlignments = self.__GenComplexFileSection__(Rule, FvChildAddr, FvParentAddr, IsMakefile=IsMakefile) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\FfsInfStatement.py", line 969, in __GenComplexFileSection__ INFO - SectList, Align = Sect.GenSection(self.OutputPath, self.ModuleGuid, SecIndex, self.KeyStringList, self, IsMakefile = IsMakefile) INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\EfiSection.py", line 218, in GenSection INFO - GenFdsGlobalVariable.GenerateSection(OutputFile, [], 'EFI_SECTION_USER_INTERFACE', INFO - File "C:\BEA\DFCI\mu_tiano_platforms\MU_BASECORE\BaseTools\Source\Python\GenFds\GenFdsGlobalVariable.py", line 466, in GenerateSection INFO - SectionData.fromstring(Ui.encode("utf_16_le")) INFO - AttributeError: 'array.array' object has no attribute 'fromstring' Kind Regards, Shivanshi