$ vcover merge -strip 0 -totals -verbose merge.ucdb testplan.ucdb coverage.ucdb
** Error: (vcover-6823) Can’t read UCDB file testplan.ucdb, the database was generated by a more recent version of Questa, and this version 10.2b can’t read it.
Solution:
$ sed -i "s|10030047|10020046|" testplan.ucdb