02-19-2014, 04:58 PM
Probably the file is corrupt.
Try to open a backup file. Look in Options -> Files -> Backup -> Files...
QM files are SQLite databases. Using WAL mode, therefore while QM is running, there also is a .qml-wal file. If you copied etc the main file, also need to copy the wal file.
How to corrupt a SQLite database file: https://www.sqlite.org/howtocorrupt.html
Try to open a backup file. Look in Options -> Files -> Backup -> Files...
QM files are SQLite databases. Using WAL mode, therefore while QM is running, there also is a .qml-wal file. If you copied etc the main file, also need to copy the wal file.
How to corrupt a SQLite database file: https://www.sqlite.org/howtocorrupt.html