Some questions in H-A classification

After filtering, the following error occurs when h-a classification is carried out.

But in this screenshots, why he can do the filtering first and then the h-a classification.

If you want to calibrate your product before polarimetric analyses, make sure you select “complex calibration” and not Sigma0.
The common speckle filters will probably cause loss of complex image information, you have to take the ones in Radar > Polarimetry > Polarimetric Speckle Filter
Their output is usually a product translated to T-matrix which can be used for decompositions and other polarimetric tools.

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