diff --git a/designer-base/src/main/java/com/fr/design/carton/MonthlyCartonFile.java b/designer-base/src/main/java/com/fr/design/carton/MonthlyCartonFile.java
index 76b3cdcce..f9118d3e1 100644
--- a/designer-base/src/main/java/com/fr/design/carton/MonthlyCartonFile.java
+++ b/designer-base/src/main/java/com/fr/design/carton/MonthlyCartonFile.java
@@ -4,7 +4,7 @@ import java.io.File;
 
 public class MonthlyCartonFile {
     private File currentMonthFile;
-    private File LastMonthFile;
+    private File lastMonthFile;
     private File nextMonthFile;
     public MonthlyCartonFile() {
 
@@ -19,11 +19,11 @@ public class MonthlyCartonFile {
     }
 
     public File getLastMonthFile() {
-        return LastMonthFile;
+        return lastMonthFile;
     }
 
     public void setLastMonthFile(File lastMonthFile) {
-        LastMonthFile = lastMonthFile;
+        this.lastMonthFile = lastMonthFile;
     }
 
     public File getNextMonthFile() {