Sentinel 1A stack

SNAP is not reading the Master file, hence stack operation is not performed,

I have more than 41GB memory/free space.

Are you confusing random access memory (RAM) with mass storage (disk) free space? 41G would be a high-end workstation, but is not a lot of free space on a 1TB disk.

The error message refers to org.jblas.NativeBlas.dgemm. You may need to install a fortran library, see

@lveci @marpet @kraftek can you help here?

Are you using SNAP 7 or already SNAP 8?
For SNAP 7 you can follow what @gnwiii suggested.
In SNAP 8 this should have been solved and should not occur.