sqlite3.OperationalError: database is locked

This error message occurs when an attempt is made to access a SQLite database that is currently locked by another process. This can happen if multiple processes are trying to access the same database file simultaneously, or if a previous connection to the database was not properly closed.

To resolve this issue, you can try the following steps:

1. Wait for the other process to finish accessing the database and release the lock.

2. Ensure that all previous connections to the database have been properly closed. If necessary, you can use the "PRAGMA busy_timeout" command to set a timeout for waiting on a database lock.

3. If you are using a shared hosting environment, check with your hosting provider to see if there are any limitations on the number of concurrent database connections.

4. If none of the above steps work, you may need to restart your application or the SQLite process to release the lock.