User not found error

Hi,

I am running the scraper from unix command mode. It was working fine in the morning. Suddenly, I got the below error in the error file:
An error occurred while executing the SQL statement. The error was User not found: SA.
java.sql.SQLException: User not found: SA
at org.hsqldb.jdbc.Util.sqlException(Unknown Source)
at org.hsqldb.jdbc.jdbcConnection.(Unknown Source)
at org.hsqldb.jdbcDriver.getConnection(Unknown Source)
at org.hsqldb.jdbcDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at com.screenscraper.util.DataMain.getConnection(DataMain.java:97)
at com.screenscraper.util.DataMain.executeSelect(DataMain.java:292)
at com.screenscraper.util.DataMain.executeSelect(DataMain.java:317)
at com.screenscraper.data.DScrapingSession.getAllScripts(DScrapingSession.java:76)
at com.screenscraper.business.BScrapingSession.getAllScripts(BScrapingSession.java:54)
at com.screenscraper.scraper.ScriptManager.loadScripts(ScriptManager.java:198)
at com.screenscraper.scraper.ScriptManager.getScripts(ScriptManager.java:108)
at com.screenscraper.model.ModelMainFrame.handleAppEvent(ModelMainFrame.java:587)
at com.screenscraper.controller.ControllerMainFrame.handleAppEvent(ControllerMainFrame.java:30
6)
at com.screenscraper.controller.ControllerMainFrame.init(ControllerMainFrame.java:70)
at com.screenscraper.controller.ControllerMain.init(ControllerMain.java:78)
at com.screenscraper.controller.ControllerMain.(ControllerMain.java:56)
at com.screenscraper.controller.ControllerMain.launchWorkbench(ControllerMain.java:582)
at com.screenscraper.controller.ControllerMain.main(ControllerMain.java:555)

Any help on the above error is appreciated
Thanks,