Please try repairing your database:
1. Go to Tools --> Options --> Misc --> Repair DB
Please try repairing your NinjaTrader Installation:
1. Shut Down NinjaTrader
2. Go to Uninstall Programs in the Windows Control Panel
3. Select NinjaTrader and hit the "repair" or "change" button and follow the instructions to repair the installation.
If that does not work, try renaming your database:
1. Shut Down NinjaTrader
2. Go to \Documents\NinjaTrader6.5\db
3. Rename the file NinjaTrader.mbd to OldNinjaTrader.mbd

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