v.db.droptable error

[clerici]

db.droptable -f table=roads_copy                                                
Forcing ...
Traceback (most recent call last):
  File "C:\Program Files\GRASS GIS
7.0.4/scripts/db.droptable.py", line 99, in <module>
    main()
  File "C:\Program Files\GRASS GIS
7.0.4/scripts/db.droptable.py", line 77, in main
    used = grass.db.db_table_in_vector(table)
  File "C:\Program Files\GRASS GIS
7.0.4\etc\python\grass\script\db.py", line 193, in
db_table_in_vector
    for f in vector_db(vect, stderr=nuldev).itervalues():
  File "C:\Program Files\GRASS GIS
7.0.4\etc\python\grass\script\vector.py", line 43, in
vector_db
    **args)
  File "C:\Program Files\GRASS GIS
7.0.4\etc\python\grass\script\core.py", line 446, in
read_command
    return handle_errors(returncode, stdout, args, kwargs)
  File "C:\Program Files\GRASS GIS
7.0.4\etc\python\grass\script\core.py", line 313, in
handle_errors
    returncode=returncode)
grass.exceptions.CalledModuleError: Module run None
['v.db.connect', '--q', '-g', 'map=pippopluto@user1',
'sep=;'] ended with error
Process ended with non-zero return code 1. See errors in the
(error) output.