What DB type do you use?
I assume this is Access.
I see 2 possible reasons:
1. Access DB reached 2 GB file size limit.
Suggestion: try to use SQLIte or SQL Server (or SQL Server Express, it is free and DB size limit is 10GB)
2. There is some issues with the locale settings. What is your locale?
Analysis imports data to Access and SQL server using .csv files. This operation may be sensitive to the decimal point separator and list separator in regional settings.
Suggestions:
1. Set locale to English US.
2. Try to use SQLite DB engine.
Note:
SQLite is available starting from LR 11.51