[GRASSLIST:2665] error in v.distance

[Leonardo Lami]

I'm testing v.distance on 5.7 and I choosed the upload table option but at the 
end of the run it says:
....
....
load_table_head(): tab=1, /home/Documenti/datigrass/Pisa/prova/dbf//danni.dbf
169 cats selected from the table
SQL: update danni set aac=5435.45 where cat=1
find_table(): table=danni
? aac
? danni
/home/Documenti/datigrass/Pisa/prova/dbf//danni.dbf
dbmi: protocol error
SQL: update danni set aac=5664.35 where cat=2

The error may be in the double "/" in the string:
load_table_head(): tab=1, /home/Documenti/datigrass/Pisa/prova/dbf//danni.dbf

please can any one help me to solve the problem.

Another question: if i click on the digit icon the program v.digit doesn't 
run, if i write in the command shell it run. Is it right?

Thank you

Leonardo Lami