Severity: Warning --> SQLite3::exec(): database is locked

[eluser]Unknown[/eluser]
Hello, first, I'm Spanish, so I apologize for my bad English.

I've a application that use a webservice how bbdd, but the sessions i store in a sqlite3 database.

It works fine, but when i open multiple pages i got this error

SQLite3::query(): Unable to prepare statement: 5, database is locked or SQLite3::exec(): database is locked

How can i solve this?

Thanks for all and sorry one more time for my bad english.