# Revision history [back]

### Build from Java Source (Windows Command Line) - TypeError

scons: warning: Ignoring missing SConscript 'build_core\SConscript'
File "C:\allseen\core\alljoyn\alljoyn\SConstruct", line 19, in <module>
TypeError: 'NoneType' object does not support item assignment:
File "C:\allseen\core\alljoyn\alljoyn\SConstruct", line 27:
vars.Update(env)
File "C:\Python27\Scripts\..\Lib\site-packages\scons-2.3.4\SCons\Variables\__init__.py", line 196:
env[option.key] = values[option.key]


I'm getting the above error when trying to build the Java code for the Alljoyn framework with the Windows command line:

C:\allseen\core\alljoyn>scons -f C:\allseen\core\alljoyn\alljoyn\SConstruct OS=win7 CPU=x86_64 VARIANT=release MSVC_VERSION=12.0 BINDINGS="core,java"


I'm following the instructions from Build from Source - Windows

Does anyone know how I can resolve this? I am able to build the C++ framework just fine.