diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba4ed72..b4385a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# Version 3.1.2 (2018-08-29)
+
+* [fix] Fixed missing detailed error messages for configuration exceptions.
+
 # Version 3.1.1 (2018-07-31)
 
 * [fix] Always make ServiceLoader use the most complete classloader it can find.
diff --git a/pom.xml b/pom.xml
index d6e9879..64d688d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,10 +19,10 @@
 
     <groupId>org.seedstack.coffig</groupId>
     <artifactId>coffig</artifactId>
-    <version>3.1.1-SNAPSHOT</version>
+    <version>3.1.2-SNAPSHOT</version>
 
     <properties>
-        <shed.version>1.1.2</shed.version>
+        <shed.version>1.1.3</shed.version>
 
         <compatibility.version>3.0.0</compatibility.version>
 
diff --git a/src/main/resources/org/seedstack/coffig/ConfigurationErrorCode.properties b/src/main/resources/org/seedstack/coffig/internal/ConfigurationErrorCode.properties
similarity index 100%
rename from src/main/resources/org/seedstack/coffig/ConfigurationErrorCode.properties
rename to src/main/resources/org/seedstack/coffig/internal/ConfigurationErrorCode.properties
diff --git a/src/test/java/org/seedstack/coffig/CoffigTest.java b/src/test/java/org/seedstack/coffig/CoffigTest.java
index ce02e6b..cdf686e 100644
--- a/src/test/java/org/seedstack/coffig/CoffigTest.java
+++ b/src/test/java/org/seedstack/coffig/CoffigTest.java
@@ -9,7 +9,9 @@
 package org.seedstack.coffig;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
 
+import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 import org.junit.Test;
 import org.seedstack.coffig.fixture.EnumFixture;
@@ -37,6 +39,9 @@ public class CoffigTest {
                     new MapNode(new NamedNode("key1", mutableValue2), new NamedNode("key2", mutableValue3))),
             new NamedNode("items", "one"));
 
+    private final ConfigurationProvider classConfigProvider = () -> new MapNode(
+            new NamedNode("someListClass", "java.lang.Object"));
+
     @Test
     public void testConfigurationNotNull() {
         Coffig coffig = Coffig.builder().withProviders(new VoidProvider()).build();
@@ -107,6 +112,19 @@ public void testGetMapAsArray() throws Exception {
         assertThat(coffig.get(App.class).elements).containsOnly("val1", "val2");
     }
 
+    @Test
+    public void testErrorMessages() throws Exception {
+        Coffig coffig = Coffig.builder().withProviders(classConfigProvider).build();
+        try {
+            coffig.get(ClassConfig.class);
+            fail("should have thrown a ConfigurationException");
+        } catch (ConfigurationException e) {
+            assertThat(e.getMessage()).isEqualTo("[CONFIGURATION] Non assignable class");
+            assertThat(e.getDescription())
+                    .isEqualTo("Class 'java.lang.Object' is not assignable to '? extends java.util.List'.");
+        }
+    }
+
     @Test
     public void testListeners() {
         AtomicInteger listener0CallCount = new AtomicInteger();
@@ -156,4 +174,8 @@ private static class App {
         String[] items;
         String[] elements;
     }
+
+    private static class ClassConfig {
+        private Class<? extends List> someListClass;
+    }
 }