The super class method is already clearing the cache.

edu.cuny.hunter.hybridize.core/src/edu/cuny/hunter/hybridize/core/refactorings/HybridizeFunctionRefactoringProcessor.java

@@ -488,12 +488,6 @@ private PythonSSAPropagationCallGraphBuilder computeCallGraphBuilder(EclipsePyth
 		return projectToCallGraphBuilder.get(project);
 	}
 
-	@Override
-	public RefactoringStatus checkInitialConditions(IProgressMonitor pm) throws CoreException, OperationCanceledException {
-		this.clearCaches();
-		return super.checkInitialConditions(pm);
-	}
-
 	@Override
 	public void clearCaches() {
 		this.getProjectToCallGraphBuilder().clear();