#10 error in dynamic tree demo

[Russell Seidel]

This NullPointerException came up while analyzing DynamicTree.java. The tool doesn't crash when this error happens, and it does analyze some of the code.

eclipse.buildId=M20110909-1335
java.version=1.6.0_27
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Command-line arguments: -os win32 -ws win32 -arch x86_64

Error
Sun Nov 20 19:40:14 EST 2011
CriticAL framework encountered a problem while analyzing:
[Class: test.DynamicTree]
[Method: <test.dynamictree: javax.swing.tree.defaultmutabletreenode="" addobject(javax.swing.tree.defaultmutabletreenode,java.lang.object,boolean)="">]</test.dynamictree:>
[Line Number: 123]

java.lang.NullPointerException
at edu.clarkson.serl.critic.interpreter.model.ExprNe.execute(ExprNe.java:57)
at edu.clarkson.serl.critic.interpreter.model.ExprNe.execute(ExprNe.java:1)
at edu.clarkson.serl.critic.interpreter.model.ExprCondition.execute(ExprCondition.java:62)
at edu.clarkson.serl.critic.interpreter.model.StmtIf.executeStmt(StmtIf.java:58)
at edu.clarkson.serl.critic.interpreter.model.StmtAbstract.execute(StmtAbstract.java:111)
at edu.clarkson.serl.critic.interpreter.Interpreter.processContext(Interpreter.java:373)
at edu.clarkson.serl.critic.interpreter.Interpreter.execute(Interpreter.java:284)
at edu.clarkson.serl.critic.jobs.internal.CriticMainJob.run(CriticMainJob.java:86)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)