database locked SQLITE

[dbb]

Help resolving this issue, the database keeps locking, the trace is :

Traceback (most recent call last):
File "C:\web2pyy\gluon\restricted.py", line 173, in restricted
exec ccode in environment
File "C:/web2pyy/applications/ET/models/db.py", line 58, in <module>
db.vho.import_from_csv_file(open('C:/data/
xxx.csv','r'),migrate=migrate)
File "C:\web2pyy\gluon\sql.py", line 1968, in import_from_csv_file
new_id = self.insert(**dict(items))
File "C:\web2pyy\gluon\sql.py", line 1879, in insert
self._db._execute(query)
File "C:\web2pyy\gluon\sql.py", line 895, in <lambda>
self._execute = lambda *a, **b: self._cursor.execute(*a, **b)
OperationalError: database is locke

[mdipierro]

please tell us more about the conditions that cause it.
If you use the shell (or background process) at the same time as the
web app make sure you unlock the db with periodic db.commit()

Massimo