test code throws in Rhino 1.7 release 2

[sgbeal]

kaboom:
pulled from github today, about 15 minutes ago....

stephan@tiny:~/cvs/env-js$ make
Exception in thread "Thread-0" org.mozilla.javascript.EcmaError: TypeError: Cannot call method "createEvent" of null
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3566)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3544)
at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3572)
at org.mozilla.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3591)
at org.mozilla.javascript.ScriptRuntime.undefCallError(ScriptRuntime.java:3610)
at org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2159)
at org.mozilla.javascript.optimizer.OptRuntime.callProp0(OptRuntime.java:117)
at org.mozilla.javascript.gen.c2._c4(Unknown Source)
at org.mozilla.javascript.gen.c2.call(Unknown Source)
at org.mozilla.javascript.optimizer.OptRuntime.callProp0(OptRuntime.java:119)
at org.mozilla.javascript.gen.c2._c120(Unknown Source)
at org.mozilla.javascript.gen.c2.call(Unknown Source)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:401)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3003)
at org.mozilla.javascript.gen.c2.call(Unknown Source)
at org.mozilla.javascript.Context$1.run(Context.java:488)
at org.mozilla.javascript.Context.call(Context.java:499)
at org.mozilla.javascript.Context.call(Context.java:486)
at org.mozilla.javascript.JavaAdapter.callMethod(JavaAdapter.java:548)
at adapter1.run(<adapter>)
at java.lang.Thread.run(Thread.java:619)

stephan@tiny:~/cvs/env-js$ less Makefile 
stephan@tiny:~/cvs/env-js$ make run-rhino
echo "load('src/env.js');window.location='test/index.html';" | java -jar rhino/js.jar
Rhino 1.7 release 2 PRERELEASE 2008 07 28
js> test/index.html
js> 
Exception in thread "Thread-0" org.mozilla.javascript.EcmaError: TypeError: Cannot call method "createEvent" of null (src/env.js#29)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3566)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3544)
at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3572)
at org.mozilla.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3591)
at org.mozilla.javascript.ScriptRuntime.undefCallError(ScriptRuntime.java:3610)
at org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2159)
at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:3142)
at script(src/env.js:29)
at script.makeRequest(src/env.js:737)
at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:2486)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:164)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:401)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3003)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:162)
at org.mozilla.javascript.Context$1.run(Context.java:488)
at org.mozilla.javascript.Context.call(Context.java:499)
at org.mozilla.javascript.Context.call(Context.java:486)
at org.mozilla.javascript.JavaAdapter.callMethod(JavaAdapter.java:548)
at adapter1.run(<adapter>)
at java.lang.Thread.run(Thread.java:619)

i tried with:
Rhino 1.7 release 2 PRERELEASE 2008 07 28
Rhino 1.7 release 2 2010 01 20