The weirdest thing is yesterday the project ran safely, today it throw an error: operator << is not clear!.
And vs located this error on BSplineDecompositionImageFilter function in itkBSplineDecompositionImageFilter.hxx.
So What should I do? And If you need more information, please let me know.
Nothing was merged to master branch since the 10th. You should provide more information, including the SHA hash of your ITK version and the line number where the exception is raised.
my itk version is 5.2.1.
I have solved this problem by rebooting the computer 
I think that Visual Studio might take the blame.
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