If you're getting repeated error messages when opening Copilink that prevent you from using it:

1. Close NinjaTrader completely

2. Navigate to: Documents\NinjaTrader 8\bin\Custom

3. Delete these two files:

4. Restart NinjaTrader and Copilink

This resets Copilink's configuration files and typically resolves persistent error messages. You'll need to reconfigure your settings after doing this.