I've even tried making a new strategy and copying/pasting the code into it, and the new strategy does not appear either on the list...
I've checked the log, and here is what it is saying for every instance of me applying:
8/5/2013 3:40:46 PM Default Unable to create instance of 'NinjaTrader.Strategy.dfh'. Most likely there is no default constructor defined, or the default constructor does not work correctly: Exception of type 'System.OutOfMemoryException' was thrown.
What to do?
Comment