MZpack Helpdesk

Message on the screen:

"Error has occurred in NinjaTrader database cache. Close NinjaTrader and delete 'Documents\NinjaTrader 8\db\cache' folder."

The solution by NinjaTrader:

Please use the following steps to rename the database file so NinjaTrader automatically creates a new one:

• Close NinjaTrader
• Go to Documents folder > NinjaTrader 8 > db > NinjaTrader.sqlite, right-click on this file and select 'Rename' and change the name to "NinjaTrader Old.sqlite" and then click off of it anywhere to save the name change
  • Please click here for a video demonstration of how to rename the Database file

From there, use the following steps to remove all of the old Historical Data from the platform and re-download the new data:

• Close NinjaTrader
• Go to the Documents folder > NinjaTrader 8 > db, this folder holds all of the historical data
  • Delete the following folders:
    • Tick
    • Minute
    • Day
    • Cache
      • Do NOT delete any other files or folders
  • After Deleting these folders, reopen NinjaTrader and it will make New ones automatically.

From here, reopen NinjaTrader. 

The radical Solution:

1. Close NinjaTrader. Delete 'Documents\NinjaTrader 8\db\cache' folder. If this didn't help see #2.
2. Close NinjaTrader. Delete 'Documents\NinjaTrader 8\db' folder. You will lose all loaded market data. Backup this folder before deleting. NinjaTrader 8 will re-create \db folder on the next run. 
3. Run this utility to delete database cache BEFORE each NinjaTrader run: https://drive.google.com/file/d/1cGTd-4SjpWO2dujzr08dj4LGDci2flqe/view?usp=sharing