SAR SLC Co-Registration Issue

Hello everyone. I’m trying to process SAR slc data without generating covariance or coherency matrix using SNAP. It all goes well, but when I tried to do co-registration to two processed images, it only outputs images filled with NaN values, for both master and slave images, like this figure.

Does anyone know why it doesn’t work? and how to solve it?

Try co-registering first.

Thank you so much! It works!

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