Can't call method "next_hit" on an undefined value at read_blast_stats.pl line
    150, <GEN2> line 253 (#1)
    (F) You used the syntax of a method call, but the slot filled by the
    object reference or package name contains an undefined value.  Something
    like this will reproduce the error:
    
        $BADREF = undef;
        process $BADREF 1,2,3;
        $BADREF->process(1,2,3);
    
Uncaught exception from user code:
    Can't call method "next_hit" on an undefined value at read_blast_stats.pl line 150, <GEN2> line 253.
 at read_blast_stats.pl line 150