diff --git a/src/main/java/de/voidplus/soundcloud/Group.java b/src/main/java/de/voidplus/soundcloud/Group.java
index 35cc259..1b71f2f 100644
--- a/src/main/java/de/voidplus/soundcloud/Group.java
+++ b/src/main/java/de/voidplus/soundcloud/Group.java
@@ -3,14 +3,14 @@
 public class Group {
 
     private Integer id;
-    private String created_at;
+    private String createdAt;
     private String permalink;
     private String name;
-    private String short_description;
+    private String shortDescription;
     private String description;
     private String uri;
-    private String permalink_url;
-    private String artwork_url;
+    private String permalinkUrl;
+    private String artworkUrl;
     private User creator;
 
     public Group()
@@ -38,7 +38,7 @@ public void setDescription(String description) {
     }
 
     public String getCreatedAt() {
-        return created_at;
+        return createdAt;
     }
 
     public String getPermalink() {
@@ -46,11 +46,11 @@ public String getPermalink() {
     }
 
     public String getShortDescription() {
-        return short_description;
+        return shortDescription;
     }
 
-    public void setShortDescription(String short_description) {
-        this.short_description = short_description;
+    public void setShortDescription(String shortDescription) {
+        this.shortDescription = shortDescription;
     }
 
     public String getUri() {
@@ -58,11 +58,11 @@ public String getUri() {
     }
 
     public String getPermalinkUrl() {
-        return permalink_url;
+        return permalinkUrl;
     }
 
     public String getArtworkUrl() {
-        return artwork_url;
+        return artworkUrl;
     }
 
     public User getCreator() {
@@ -71,10 +71,10 @@ public User getCreator() {
 
     @Override
     public String toString() {
-        return "Group [id=" + id + ", created_at=" + created_at
+        return "Group [id=" + id + ", createdAt=" + createdAt
                 + ", permalink=" + permalink + ", name=" + name + ", uri="
-                + uri + ", permalink_url=" + permalink_url + ", artwork_url="
-                + artwork_url + ", creator=" + creator + "]";
+                + uri + ", permalinkUrl=" + permalinkUrl + ", artworkUrl="
+                + artworkUrl + ", creator=" + creator + "]";
     }
     
-}
\ No newline at end of file
+}
diff --git a/src/main/java/de/voidplus/soundcloud/SoundCloud.java b/src/main/java/de/voidplus/soundcloud/SoundCloud.java
index 8f5b529..918c599 100644
--- a/src/main/java/de/voidplus/soundcloud/SoundCloud.java
+++ b/src/main/java/de/voidplus/soundcloud/SoundCloud.java
@@ -7,7 +7,6 @@
 import org.apache.http.HttpStatus;
 import org.json.simple.JSONArray;
 import org.json.simple.parser.JSONParser;
-
 import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -17,10 +16,8 @@
 
 public class SoundCloud {
 
-
     public static final String VERSION = "0.2.1";
 
-
     public enum Type {
         USER,
         TRACK,
@@ -309,7 +306,7 @@ private <T> T api(String api, Rest rest, Object value, String[] filters) {
 
                         }
                     } else {
-                        System.err.println("Invalid status received: " + response.getStatusLine());
+                        System.err.println("Error, Invalid status received: " + response.getStatusLine());
                     }
                     break;
                 case POST:
@@ -933,4 +930,4 @@ private String replaceJsonsBlank(String string) {
         return matcher.replaceAll(":null");
     }
 
-}
\ No newline at end of file
+}
diff --git a/src/main/java/de/voidplus/soundcloud/User.java b/src/main/java/de/voidplus/soundcloud/User.java
index 4f3ef2c..1d0dd88 100644
--- a/src/main/java/de/voidplus/soundcloud/User.java
+++ b/src/main/java/de/voidplus/soundcloud/User.java
@@ -31,11 +31,11 @@ public class User {
     public User()
     {
     }
-    
+
     public Integer getId() {
         return id;
     }
-    
+
     public String getUsername() {
         return username;
     }
@@ -183,4 +183,4 @@ public String toString() {
                 + ", primary_email_confirmed=" + primary_email_confirmed + "]";
     }
     
-}
\ No newline at end of file
+}