Raise error if one of the required ordertypes is not present

freqtrade/constants.py

@@ -12,6 +12,7 @@ DEFAULT_STRATEGY = 'DefaultStrategy'
 DEFAULT_DB_PROD_URL = 'sqlite:///tradesv3.sqlite'
 DEFAULT_DB_DRYRUN_URL = 'sqlite://'
 UNLIMITED_STAKE_AMOUNT = 'unlimited'
+REQUIRED_ORDERTYPES = ['buy', 'sell', 'stoploss']
 
 
 TICKER_INTERVAL_MINUTES = {

freqtrade/strategy/resolver.py

@@ -84,6 +84,10 @@ class StrategyResolver(object):
         else:
             config['order_types'] = self.strategy.order_types
 
+        if not all(k in self.strategy.order_types for k in constants.REQUIRED_ORDERTYPES):
+            raise ImportError(f"Impossible to load Strategy '{self.strategy.__class__.__name__}'. "
+                              f"Order-types mapping is incomplete.")
+
         # Sort and apply type conversions
         self.strategy.minimal_roi = OrderedDict(sorted(
             {int(key): value for (key, value) in self.strategy.minimal_roi.items()}.items(),