Hi£¬ (Sorry for the previous incomplete email!) For the second one: Dai already pointed out the problem, a ending slash(\) should be added to the nasm path variable. You can find the how nasm path is processed in edksetup.bat: :check_NASM if not defined NASM_PREFIX ( @echo. @echo !!! WARNING !!! NASM_PREFIX environment variable is not set @if exist "C:\nasm\nasm.exe" @set "NASM_PREFIX=C:\nasm\" @if exist "C:\nasm\nasm.exe" @echo Found nasm.exe, setting the environment variable to C:\nasm\ @if not exist "C:\nasm\nasm.exe" echo Attempting to build modules that require NASM will fail. ) And iasl path variable(IASL_PREFIX) is handled similarly. Maybe they should be adopted to handle with and without ending slash(\). Best Regards, Hiber On 06/30/2019 21:22, Ni, Ray wrote: Bob, Any comments? From:´÷£¬•ÔÕþ [mailto:cloud0907@yahoo.com.tw] Sent: Sunday, June 30, 2019 3:37 PM To: Justen, Jordan L ; afish@apple.com; Ni, Ray Subject: May I become a contributor in EmulatorPkg ? Dears, I live in Taiwan so please forgive my English pool. I download edk2 source code from Github recently and I encounter two build error when I build EmulatorPkg (I use Visual Studio 2017 ). First is in GenPcdDb.py, this error means parameter used to unpack is zero, please refer below : Second is in tools_def.txt, this error means there is missing slash before nasm.exe, please refer below : You can search ¡°clouddai-test¡± in Attachment so that you will easy understand what I say. If I need submit more official document for become a contributor please let me know, or if my modification need obey some rule please also let me know, I am waiting your response