Error Explanation: This error indicates that your credentials are missing in the connection configuration for your NinjaTrader platform.

Solution:
1. Ensure you have entered the correct credentials in the connection configuration.
2. Follow the appropriate setup instructions based on your platform:
• Rithmic & NinjaTrader Setup Instructions
• Tradovate & NinjaTrader Setup Instructions

Solution:
1. Verify that your settings are configured correctly.
2. Ensure that Market Data in RTrader Pro is set to OFF.
3. In NinjaTrader, go to the plug-in mode settings and make sure it is UNCHECKED.
​
For detailed setup instructions, follow the steps provided here.

Solution:
1. Verify that your LICENSE KEY and credentials are correct.
2. Open NinjaTrader and delete your APEX "My Rithmic for NinjaTrader Brokerage" connection under the connection configuration.
3. Click Apply, then OK to save the changes.
4. Close NinjaTrader 8 and restart it.
5. Re-add the APEX connection using your credentials.
6. Click Apply, then OK to save the new connection.
7. Reboot your machine and restart NinjaTrader 8.
​
This process ensures the connection is reset and properly configured.

Solution:
1. Go to the Connections menu in NinjaTrader.
2. Disconnect from "MY Rithmic for NinjaTrader Brokerage".
3. Wait a few seconds and then reconnect to the same connection.

Solution: Close and restart your NinjaTrader 8 application to refresh the platform and resolve potential temporary issues.

Solution:
1. Disconnect from your "MY Rithmic for NinjaTrader Brokerage" connection in NinjaTrader.
2. Wait a few moments, then reconnect to the same connection.
​
This simple step often resolves connectivity issues with Rithmic on NinjaTrader.

Error Explanation: This error indicates that there are no active Tradovate accounts linked to your NinjaTrader platform.
​
​Solution: Verify your account status to ensure it is active. If necessary, log in to your account to confirm or activate your subscription. Once your account is active, reconnect it to NinjaTrader to resolve the issue.

Error Message: "Provider 'Rithmic for NinjaTrader Brokerage' already has a running connection."
This indicates that there are multiple instances of the Rithmic connection active. To resolve this, locate the previous connections in the NinjaTrader platform and select the "Remove" option next to any duplicate or unnecessary connections. This will ensure only one active connection is running at a time.

Error Explanation: This behavior suggests a connection loss between your computer and NinjaTrader servers.
​
​Solution: Follow these network troubleshooting steps, testing after each one:
1. Restart NinjaTrader, your computer, and your modem/router.
2. Install all available Windows updates, then restart your computer.
3. Disable your VPN service, if applicable.
4. Clear your DNS: open Command Prompt as administrator, type ipconfig /flushdns, and press Enter.
5. Add the Documents\NinjaTrader 8 folder to the exceptions list for your firewall, antivirus, or backup software.
6. If you're using WiFi, switch to a wired ethernet connection; if you're already hardwired, try connecting via WiFi.

Explanation: This message indicates that your account has reached the drawdown limit and has been liquidated.
​
​Solution: For detailed information and next steps, click here. Review your trading strategy to avoid exceeding the drawdown limit in the future.

Error Explanation: This occurs because OCO (One Cancels Other) mode is activated, causing the initial OCO order to be canceled.
​
​Solution:
1. Press CTRL + Z on your keyboard to deactivate OCO mode.
2. Confirm that the small green "OCO" icon is no longer active.
​
For further instructions on managing OCO orders, click here.

Error Explanation: This message indicates that you have sent too many cancellation requests in a short period, triggering a system limitation. If you continue, the system may log you out.
​
​Solution:
1. Wait at least 30 seconds before attempting any further cancellation requests.
2. Contact your broker to discuss this error, as it may indicate your account requires additional configuration.
​
Addressing this issue with your broker is essential to prevent recurring problems and avoid potential account lockouts.

Solution: To resolve this issue, disable the "Liquidating Only" option in your RTrader dashboard:
1. Open the RTrader dashboard.
2. Right-click on the account listed in the dashboard.
3. Select Enable Liquidating Only (Trader) to turn it off.
​
This will allow normal trading activity on the account. Restart your platform to ensure the change takes effect.

Error Explanation: This error occurs because the Time in Force (TIF) is set to GTD (Good 'Til Date) without specifying a date.
​
​Solution:
1. Enter a valid date for the GTD setting.
2. Alternatively, change the TIF setting to GTC (Good 'Til Canceled) or Day if no specific date is required.
​
Adjusting the TIF ensures your orders are correctly configured and executed.

Error Explanation: This indicates that you are attempting to trade an expired contract.
​
​Solution: Visit the CME Group Futures website to verify the current contract month for the instrument. To learn how to roll over your contracts to the current month, follow the steps provided here. Ensure your platform is updated with the latest contract to avoid trading issues.

Message: Your Tradovate account on NinjaTrader has reached the drawdown limit and requires a reset.
​
​Solution: To resolve this, log in to your Tradovate account and perform an account reset. This will clear the drawdown status and allow you to resume trading. Ensure you review your trading plan to prevent hitting the drawdown limit again in the future.

Error Explanation: This error typically occurs when an additional action is attempted on an order that is in the process of being changed, filled, or canceled. NinjaTrader does not allow modifications to an order while the initial action is still in progress.
​
​Solution: To avoid this error, wait until the initial action on the order is fully completed. Once the action is finalized, you can proceed with any further modifications or actions on the order.

Error Message: "Password should be specified." This typically occurs when a saved connection is missing its stored credentials.
​
​Solution: Open the connection in NinjaTrader's Connections menu, re-enter your username and password, and save. If the field won't retain the password, delete and re-add the connection from scratch.

Error Message: Market data failed get_order_book error: 13 — this indicates missing Level 2 data. For Rithmic, enable it under Rithmic Addons; for Tradovate, add Level 2 data under Settings > Subscriptions on their web platform.

Error Explanation: This message indicates an issue within your custom indicators.
​
​Solution:
1. Review the error details in NinjaTrader's Log tab to identify the problematic indicator.
2. Disable or remove the faulty custom indicator.
3. For detailed instructions on resolving indicator issues, click here.
​
This will ensure your platform runs smoothly without interference from faulty indicators.

Solution:
1. Uninstall NinjaTrader 8 from your system.
2. Download and install the latest version of NinjaTrader 8 from the official website.
3. Follow the installation instructions provided here.
​
Reinstalling ensures you are using the most up-to-date and stable version of the platform.

Solution:
1. Close the NinjaTrader 8 application.
2. Reboot your computer to ensure all processes are refreshed.
3. Once the system restarts, open NinjaTrader 8 again.
​
This process helps resolve many common issues by resetting the platform and system resources.

Solution for Mac Users with Parallels: If you are using a Mac with Parallels running an older NinjaTrader 8 build, try switching to the version of NinjaTrader 8 recommended for Parallels compatibility on our official download page. Restart your platform after installation to confirm the issue is resolved.

Solution: To resolve the issue, turn off your market data, then reconnect. See the "session count to exceed its maximum" entry above for the exact plug-in mode steps.

Solution:
1. Navigate to the folder in the specified path.
2. Right-click on the folder and select Properties.
3. In the General tab, locate the "Read-only" attribute.
4. Uncheck the Read-only box and click Apply, then OK.
​
This will allow NinjaTrader to access the folder without restrictions. Restart NinjaTrader to confirm the issue is resolved.

Solution:
1. Close NinjaTrader completely.
2. Navigate to the following folder on your PC:
Documents\NinjaTrader 8\templates\Risk
3. Delete the file named NinjaTrader Brokerage Default.xml.
4. Restart NinjaTrader to resolve the issue.
​
*Ensure NinjaTrader files are excluded from OneDrive syncing to avoid further issues.

Error Explanation: This error indicates that another application on your PC, such as a cloud storage or backup provider like OneDrive, is blocking NinjaTrader from accessing its files.
​
​Solution: Ensure that NinjaTrader directories are excluded from syncing or backup processes to prevent interference. Adjust your cloud or backup provider settings to allow uninterrupted access to NinjaTrader files.

Warning: This message indicates that NinjaTrader has pre-loaded instruments that are not included in your data package. While these instruments may appear in your platform, trading them is not possible with your current account. Additionally, any data displayed for these instruments will be delayed. This is simply a notification and does not impact the functionality of instruments included in your data plan.

Error Message: "Error fetching external content, please try again later."
To resolve this issue, manually adjust your computer's clock to the Eastern Time Zone. This will help synchronize your system with the required settings and fix the error.

Error Explanation: This issue may be caused by Windows Defender or McAfee blocking NinjaTrader.
​
​Solution: Follow these instructions for both Windows Defender and McAfee:
​
​For Windows Defender:
1. Open Settings on your PC.
2. Navigate to Update & Security > Windows Security.
3. Select Firewall & network protection.
4. Click Allow an app through firewall.
5. Click Change Settings in the upper-right corner.
6. Check all the boxes for any NinjaTrader listings.
7. Click OK to save changes.
​
​For McAfee:
If Windows Defender adjustments don't resolve the issue, follow the steps outlined in this McAfee guide: How to exclude files from virus scans on Windows or macOS (TS102056). Ensure you select the correct version of McAfee for your PC.
​
Adding NinjaTrader as an exclusion in these programs should resolve the issue. Read more here.

Error Explanation: This message pertains to a product or service provided by ApexInvesting.com.
​Solution: For assistance, reach out to Apex Investing directly through their support page here. They will be able to provide specific guidance regarding the error.

If none of the above resolved your issue, NinjaTrader Desktop's diagnostic files let our support representatives quickly troubleshoot unexpected errors and behavior. Follow the steps below to send them to our team:

For a full screenshot walkthrough, see NinjaTrader's own guide: How Do I Send Log and Trace Diagnostic Files to NinjaTrader?

​