diff --git a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
index cf3192c8..27b62e2f 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
@@ -121,6 +121,11 @@ public class FileManagerImpl implements FileManager {
         return null;
     }
 
+    @Override
+    public FileManager getCurrentInstance() {
+        return null;
+    }
+
     @Override
     public FileManager enableAutoCreateParent() {
         this.autoCreateParent = true;
@@ -164,4 +169,44 @@ public class FileManagerImpl implements FileManager {
         }
         return this.setPath(resolvedPath);
     }
+
+    @Override
+    public FileManager saveXml(Document document, String fileName) throws IOException {
+        return null;
+    }
+
+    @Override
+    public FileManager saveXml(Document document) throws IOException {
+        return null;
+    }
+
+    @Override
+    public FileManager saveBitmap(Bitmap bitmap, String fileName) throws IOException {
+        return null;
+    }
+
+    @Override
+    public FileManager saveBitmap(Bitmap bitmap) throws IOException {
+        return null;
+    }
+
+    @Override
+    public Document loadXml(String fileName) throws IOException {
+        return null;
+    }
+
+    @Override
+    public Document loadXml() throws IOException {
+        return null;
+    }
+
+    @Override
+    public Bitmap loadBitmap(String fileName) throws IOException {
+        return null;
+    }
+
+    @Override
+    public Bitmap loadBitmap() throws IOException {
+        return null;
+    }
 }