diff --git a/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojo.java b/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojo.java
index 7acc4280b..9dce1eefe 100644
--- a/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojo.java
+++ b/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojo.java
@@ -51,6 +51,7 @@ public class CoffeeScriptCompilerMojo extends AbstractWisdomWatcherMojo implemen
     public static final String COFFEE_SCRIPT_NPM_NAME = "coffee-script";
     public static final String COFFEE_SCRIPT_COMMAND = "coffee";
     public static final String ERROR_TITLE = "CoffeeScript Compilation Error";
+    public static final String COFFEESCRIPT_VERSION = "1.9.2";
 
     private NPM coffee;
 
@@ -60,7 +61,7 @@ public class CoffeeScriptCompilerMojo extends AbstractWisdomWatcherMojo implemen
      *
      * @see <a href="https://www.npmjs.org/">NPM Web Site</a>.
      */
-    @Parameter(defaultValue = "1.8.0")
+    @Parameter(defaultValue = COFFEESCRIPT_VERSION)
     String coffeeScriptVersion;
 
     /**
diff --git a/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/LessCompilerMojo.java b/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/LessCompilerMojo.java
index 19e8e3db3..33662071c 100644
--- a/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/LessCompilerMojo.java
+++ b/core/wisdom-maven-plugin/src/main/java/org/wisdom/maven/mojos/LessCompilerMojo.java
@@ -52,6 +52,7 @@ public class LessCompilerMojo extends AbstractWisdomWatcherMojo implements Const
 
     public static final String LESS_NPM_NAME = "less";
     public static final String ERROR_TITLE = "Less Compilation Error";
+    public static final String LESS_VERSION = "1.7.5";
 
     private NPM less;
 
@@ -64,7 +65,7 @@ public class LessCompilerMojo extends AbstractWisdomWatcherMojo implements Const
      *
      * @see <a href="https://www.npmjs.org/">NPM Web Site</a>.
      */
-    @Parameter(defaultValue = "1.7.3")
+    @Parameter(defaultValue = LESS_VERSION)
     String lessVersion;
 
     /**
diff --git a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CSSMinifierMojoTest.java b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CSSMinifierMojoTest.java
index a0c210326..935afa589 100644
--- a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CSSMinifierMojoTest.java
+++ b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CSSMinifierMojoTest.java
@@ -72,7 +72,7 @@ public void setUp() throws IOException {
         less.project = project;
         less.basedir = new File(FAKE_PROJECT);
         less.buildDirectory = new File(FAKE_PROJECT_TARGET);
-        less.lessVersion = "1.7.3";
+        less.lessVersion = LessCompilerMojo.LESS_VERSION;
 
         cleanup();
     }
diff --git a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojoTest.java b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojoTest.java
index 539c21800..71d041d31 100644
--- a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojoTest.java
+++ b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/CoffeeScriptCompilerMojoTest.java
@@ -33,6 +33,7 @@
 import java.io.IOException;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
 
 /**
  * Check the behavior of the CoffeeScript mojo.
@@ -56,7 +57,7 @@ public void setUp() throws IOException {
         mojo.basedir = new File(FAKE_PROJECT);
         mojo.buildDirectory = new File(FAKE_PROJECT_TARGET);
         mojo.buildDirectory.mkdirs();
-        mojo.coffeeScriptVersion = "1.8.0";
+        mojo.coffeeScriptVersion = CoffeeScriptCompilerMojo.COFFEESCRIPT_VERSION;
         cleanup();
     }
 
@@ -133,6 +134,29 @@ public void testWatching() throws MojoFailureException, MojoExecutionException,
         assertThat(ext.lastModified()).isGreaterThanOrEqualTo(originalLastModified);
     }
 
+    @Test
+    public void testErrorDetection() throws IOException, MojoExecutionException {
+        cleanup();
+        // Execute also initialize the mojo
+        mojo.execute();
+
+        // Copy the broken file
+        File broken = new File("src/test/resources/coffee/invalid.coffee");
+        final File copy = new File(mojo.basedir, "src/main/resources/assets/invalid.coffee");
+        FileUtils.copyFile(broken, copy);
+        try {
+            mojo.fileCreated(copy);
+            fail("Watching Exception expected when compiling a broken CoffeeScript file");
+        } catch (WatchingException e) {
+            assertThat(e.getLine()).isEqualTo(3);
+            assertThat(e.getFile().getAbsolutePath()).isEqualTo(copy.getAbsolutePath());
+            assertThat(e.getCharacter()).isEqualTo(25);
+            assertThat(e.getMessage()).contains("unexpected end of input");
+        } finally {
+            FileUtils.deleteQuietly(copy);
+        }
+    }
+
     private void cleanup() {
         FileUtils.deleteQuietly(mojo.buildDirectory);
     }
diff --git a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/LessCompilerMojoTest.java b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/LessCompilerMojoTest.java
index b1038a355..f737032ee 100644
--- a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/LessCompilerMojoTest.java
+++ b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/mojos/LessCompilerMojoTest.java
@@ -33,6 +33,7 @@
 import java.io.IOException;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.fail;
 
 /**
  * Checks the Less Compiler Mojo.
@@ -56,7 +57,7 @@ public void setUp() throws IOException {
         mojo.basedir = new File(FAKE_PROJECT);
         mojo.buildDirectory = new File(FAKE_PROJECT_TARGET);
         mojo.buildDirectory.mkdirs();
-        mojo.lessVersion = "1.7.3";
+        mojo.lessVersion = LessCompilerMojo.LESS_VERSION;
         cleanup();
     }
 
@@ -155,6 +156,29 @@ public void testUsingParameters() throws MojoFailureException, MojoExecutionExce
                 .contains("-webkit-box-shadow:0 0 5px rgba(0,0,0,0.3);");
     }
 
+    @Test
+    public void testErrorDetection() throws IOException, MojoExecutionException {
+        cleanup();
+        // Execute also initialize the mojo
+        mojo.execute();
+
+        // Copy the broken file
+        File broken = new File("src/test/resources/less/invalid.less");
+        final File copy = new File(mojo.basedir, "src/main/resources/assets/invalid.less");
+        FileUtils.copyFile(broken, copy);
+        try {
+            mojo.fileCreated(copy);
+            fail("Watching Exception expected when compiling a broken Less file");
+        } catch (WatchingException e) {
+            assertThat(e.getLine()).isEqualTo(3);
+            assertThat(e.getFile().getAbsolutePath()).isEqualTo(copy.getAbsolutePath());
+            assertThat(e.getCharacter()).isEqualTo(3);
+            assertThat(e.getMessage()).contains("Unrecognised input");
+        } finally {
+            FileUtils.deleteQuietly(copy);
+        }
+    }
+
     private void cleanup() {
         FileUtils.deleteQuietly(mojo.buildDirectory);
     }
diff --git a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/node/NodeManagerTest.java b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/node/NodeManagerTest.java
index daa3fbf19..2635eab88 100644
--- a/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/node/NodeManagerTest.java
+++ b/core/wisdom-maven-plugin/src/test/java/org/wisdom/maven/node/NodeManagerTest.java
@@ -29,6 +29,7 @@
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 import org.wisdom.maven.mojos.AbstractWisdomMojo;
+import org.wisdom.maven.mojos.CoffeeScriptCompilerMojo;
 
 import java.io.File;
 import java.io.IOException;
@@ -83,7 +84,7 @@ public void testInstallationOfCoffeeScript() throws IOException, ParseException
         when(mojo.getLog()).thenReturn(log);
         when(mojo.getNodeManager()).thenReturn(manager);
 
-        NPM npm = NPM.npm(mojo, "coffee-script", "1.8.0");
+        NPM npm = NPM.npm(mojo, "coffee-script", CoffeeScriptCompilerMojo.COFFEESCRIPT_VERSION);
         assertThat(npm).isNotNull();
 
         assertThat(npm.findExecutable("coffee")).isFile();
@@ -97,11 +98,11 @@ public void testReinstallation() throws IOException, ParseException {
         when(mojo.getLog()).thenReturn(log);
         when(mojo.getNodeManager()).thenReturn(manager);
 
-        NPM npm = NPM.npm(mojo, "coffee-script", "1.8.0");
+        NPM npm = NPM.npm(mojo, "coffee-script", CoffeeScriptCompilerMojo.COFFEESCRIPT_VERSION);
         assertThat(npm).isNotNull();
         assertThat(npm.findExecutable("coffee")).isFile();
 
-        NPM npm2 = NPM.npm(mojo, "coffee-script", "1.8.0");
+        NPM npm2 = NPM.npm(mojo, "coffee-script", CoffeeScriptCompilerMojo.COFFEESCRIPT_VERSION);
         assertThat(npm).isEqualTo(npm2);
         assertThat(npm.hashCode()).isEqualTo(npm2.hashCode());
     }
@@ -114,9 +115,9 @@ public void testExecution() throws IOException, ParseException, MojoExecutionExc
         when(mojo.getLog()).thenReturn(log);
         when(mojo.getNodeManager()).thenReturn(manager);
 
-        NPM npm = NPM.npm(mojo, "coffee-script", "1.8.0");
+        NPM npm = NPM.npm(mojo, "coffee-script", CoffeeScriptCompilerMojo.COFFEESCRIPT_VERSION);
 
-        File input = new File("target/test-classes/coffee");
+        File input = new File("target/test-classes/coffee/test.coffee");
         File output = new File("target/test/coffee");
         output.mkdirs();
         int exit = npm.execute("coffee", "--compile", "--map", "--output", output.getAbsolutePath(),
diff --git a/core/wisdom-maven-plugin/src/test/resources/coffee/invalid.coffee b/core/wisdom-maven-plugin/src/test/resources/coffee/invalid.coffee
new file mode 100644
index 000000000..e3f359a58
--- /dev/null
+++ b/core/wisdom-maven-plugin/src/test/resources/coffee/invalid.coffee
@@ -0,0 +1,3 @@
+number   = 42
+opposite = true
+Not a valid coffee file.
\ No newline at end of file
diff --git a/core/wisdom-maven-plugin/src/test/resources/less/invalid.less b/core/wisdom-maven-plugin/src/test/resources/less/invalid.less
new file mode 100644
index 000000000..905c4aaab
--- /dev/null
+++ b/core/wisdom-maven-plugin/src/test/resources/less/invalid.less
@@ -0,0 +1,5 @@
+// This file is not valid for testing purpose.
+h1 {
+  font: this is not a valid less file.
+  color: red
+}
\ No newline at end of file