Corrected mistake in error message

reading_machine/src/Classifier.cpp

@@ -56,7 +56,7 @@ Classifier::Classifier(const std::string & name, std::filesystem::path path, std
             }
           }
         }))
-    util::myThrow(fmt::format("Invalid line '{}', expected '{}'\n", definition[0], "(LossMultiplier :) {state1,multiplier1 state2,multiplier2...}"));
+    util::myThrow(fmt::format("Invalid line '{}', expected '{}'\n", definition[1], "(LossMultiplier :) {state1,multiplier1 state2,multiplier2...}"));
 
   initNeuralNetwork(definition);
 }