diff --git a/calculatorpp-core/src/main/java/org/solovyev/android/calculator/model/AFunction.java b/calculatorpp-core/src/main/java/org/solovyev/android/calculator/model/AFunction.java
index 1e2c8a4d..6ee10a7b 100644
--- a/calculatorpp-core/src/main/java/org/solovyev/android/calculator/model/AFunction.java
+++ b/calculatorpp-core/src/main/java/org/solovyev/android/calculator/model/AFunction.java
@@ -54,7 +54,7 @@ public class AFunction implements IFunction, MathPersistenceEntity, Serializable
 	@NotNull
 	private String content;
 
-	@ElementList
+	@ElementList(type = String.class)
 	@NotNull
 	private List<String> parameterNames = new ArrayList<String>();
 
diff --git a/calculatorpp/proguard.cfg b/calculatorpp/proguard.cfg
index 2b2b7cfb..796ed57d 100644
--- a/calculatorpp/proguard.cfg
+++ b/calculatorpp/proguard.cfg
@@ -63,7 +63,24 @@
 -dontwarn com.google.common.collect.MinMaxPriorityQueue
 
 -keep class org.simpleframework.xml.** { *; }
--keep class * implements  org.solovyev.android.calculator.model.MathPersistenceEntity
+-keep class * implements org.solovyev.android.calculator.model.MathPersistenceEntity
+-keep class * implements org.solovyev.android.calculator.MathEntityPersistenceContainer
+
+#
+#*********************************************************************
+#
+#                          LOGS
+#
+#*********************************************************************
+#
+
+-assumenosideeffects class android.util.Log {
+    public static int v(...);
+    public static int d(...);
+    public static int i(...);
+    public static int w(...);
+    public static int e(...);
+}
 
 #
 #*********************************************************************
diff --git a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
index fb0ce759..cb6462f8 100644
--- a/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
+++ b/calculatorpp/src/main/java/org/solovyev/android/calculator/CalculatorApplication.java
@@ -22,7 +22,7 @@ import org.solovyev.android.calculator.widget.CalculatorWidgetHelper;
 /*@ReportsCrashes(formKey = "dEhDaW1nZU1qcFdsVUpiSnhON0c0ZHc6MQ",
         mode = ReportingInteractionMode.TOAST)*/
 @ReportsCrashes(formKey = "",
-        mailTo = "se.solovyev+programming+calculatorpp+crashes@gmail.com",
+        mailTo = "se.solovyev+programming+calculatorpp+crashes+1.5.0b@gmail.com",
         mode = ReportingInteractionMode.DIALOG,
         resToastText = R.string.crashed,
         resDialogTitle = R.string.crash_dialog_title,