diff --git a/numass-core/src/main/java/inr/numass/data/NumassDataUtils.java b/numass-core/src/main/java/inr/numass/data/NumassDataUtils.java
index fe83133b..56f3fe38 100644
--- a/numass-core/src/main/java/inr/numass/data/NumassDataUtils.java
+++ b/numass-core/src/main/java/inr/numass/data/NumassDataUtils.java
@@ -36,7 +36,7 @@ public class NumassDataUtils {
 
             @Override
             public Meta meta() {
-                MetaBuilder metaBuilder = new MetaBuilder("meta");
+                MetaBuilder metaBuilder = new MetaBuilder();
                 sets.forEach(set -> metaBuilder.putNode(set.getName(), set.meta()));
                 return metaBuilder;
             }
diff --git a/numass-main/src/main/java/inr/numass/NumassIO.java b/numass-main/src/main/java/inr/numass/NumassIO.java
index cde9755f..dbf9bb21 100644
--- a/numass-main/src/main/java/inr/numass/NumassIO.java
+++ b/numass-main/src/main/java/inr/numass/NumassIO.java
@@ -95,7 +95,7 @@ public class NumassIO extends BasicIOManager {
         }
 
         String dirName = String.join(File.separator, tokens);
-        String fileName = name.removeNameSpace().toString();
+        String fileName = name.removeNameSpace().toString() + ".out";
         OutputStream out = buildOut(getWorkDirectory(), dirName, fileName);
         registry.add(out);
         return out;
diff --git a/numass-main/src/main/java/inr/numass/WorkspaceTest.java b/numass-main/src/main/java/inr/numass/WorkspaceTest.java
index 49f4f991..0a87a6fe 100644
--- a/numass-main/src/main/java/inr/numass/WorkspaceTest.java
+++ b/numass-main/src/main/java/inr/numass/WorkspaceTest.java
@@ -24,7 +24,7 @@ public class WorkspaceTest {
         String storagepath = "D:\\Work\\Numass\\data\\";
         Workspace workspace = BasicWorkspace.builder()
                 .setContext(Numass.buildContext())
-                .loadData("", new StorageDataFactory(), new MetaBuilder("storage").putValue("path", storagepath))
+                .data("", new StorageDataFactory(), new MetaBuilder("storage").putValue("path", storagepath))
                 
                 .build();
     }