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First, install all updates (Menu > Help > Check for Updates) and restart SNAP after their installation.
A good start is to correctly load Sentinel-2 data into SNAP:
Make sure you have the latest version of SNAP (Menu > Help > Check For Updates) and try it like this:
There you select the file that contains MTD
how to open a shape file in snap?
you can import vectosr in SNAP only when a raster is currently opened, at best with a similar (or larger) extent. So, first open a raster product, then you can add the shapefile by selecting the product and then File > Import > Vector
thank you… it worked as you said…