Bug fix: pre-strategy generation check done before model construction.

git-svn-id: https://www.prismmodelchecker.org/svn/prism/prism/trunk@8072 bbc10eb1-c90d-0410-af57-cb519fbb1720

prism/src/prism/Prism.java

@@ -2706,18 +2706,18 @@ public class Prism extends PrismComponent implements PrismSettingsListener
 				setEngine(Prism.EXPLICIT);
 			}
 		}
-		// Compatibility check
-		if (genStrat && currentModelType.nondeterministic() && !getExplicit()) {
-			if (!((NondetModel) currentModel).areAllChoiceActionsUnique())
-				throw new PrismException("Cannot generate strategies with the current engine "
-						+ "because some state of the model do not have unique action labels for each choice. "
-						+ "Either switch to the explicit engine or add more action labels to the model");
-		}
-
 		try {
 			// Build model, if necessary
 			buildModelIfRequired();
 
+			// Compatibility check
+			if (genStrat && currentModelType.nondeterministic() && !getExplicit()) {
+				if (!((NondetModel) currentModel).areAllChoiceActionsUnique())
+					throw new PrismException("Cannot generate strategies with the current engine "
+							+ "because some state of the model do not have unique action labels for each choice. "
+							+ "Either switch to the explicit engine or add more action labels to the model");
+			}
+
 			// Create new model checker object and do model checking
 			if (!getExplicit()) {
 				ModelChecker mc = createModelChecker(propertiesFile);