[midPoint] getting old value in mapping, missing something in script

[Jason Everling]

I must be missing something, I scoured the forums and pages,

oldObj = midpoint.getFocusContext().getObjectOld();
oldValue = basic.getExtensionPropertyValue(oldObj, 'http://namespace',
'attribute1);
return oldValue;

Error:
No signature of method:
com.evolveum.midpoint.model.common.expression.functions.BasicExpressionFunctions.getExtensionPropertyValue()
is applicable for argument types: (com.evolveum.midpoint.prism.PrismObject,
java.lang.String, java.lang.String)
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