Unwrap Multilooked phase?

I was multilooked filtered intefereogram, but not pahse that values i, q +coherence. After that I created phase using bandmath (function phase(q,i)). But ahter that snaphu exprt is impossibele it gives errot taht there is no phase band. Why always “standard way” is possible in snap?

Run multilook on your interferogram without selecting any bands. Your output should include the same bands you had in your input.