Log file reuse Problem

" Date 20/12/2008 17:30:19
Log SQL Server (Current - 20/12/2009 00:00:00)

Source spid62

Message 'ImportSystem' is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases"

Simple one this, the error tells you exactly what to do...

select log_reuse_wait_desc, *  from sys.databases

The log file cannot be reused due to an Active Transaction.