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Cannot invoke method positive() on null object at org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77) at org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelpe r.java:854) at
java.lang.NullPointerException: Cannot invoke 
method positive() on null object
	at 
org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:77)
	at 
org.codehaus.groovy.runtime.InvokerHelper.invokePogoMethod(InvokerHelpe
r.java:854)
	at 
org.codehaus.groovy.runtime.InvokerHelper.invokeMethod(InvokerHelper.ja
va:831)
	at 
org.codehaus.groovy.runtime.InvokerHelper.unaryPlus(InvokerHelper.java:
305)
	at 
org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unaryPlus(ScriptBytec
odeAdapter.java:759)	at ss.FullScript_Domme_report.run(script14558099150781591656165.groovy:54)	at ss.desktop.MainFrame$2.run(MainFrame.java:605)