diff --git a/p1/src/main/java/cs448/project1.java b/p1/src/main/java/cs448/project1.java
index 05e2eff..98f59d0 100644
--- a/p1/src/main/java/cs448/project1.java
+++ b/p1/src/main/java/cs448/project1.java
@@ -96,7 +96,7 @@ public class project1 {
             throw e;
         }
 
-        return "";
+        return null;
     }
 
     String select_mainmemory(String key){
diff --git a/p1/test b/p1/test
index 8a26fcb..423a273 100755
--- a/p1/test
+++ b/p1/test
@@ -5,7 +5,7 @@ testCase() {
 }
 
 data_10="./data_10MB.tsv"
-data_30="./data_10MB.tsv"
+data_30="./data_30MB.tsv"
 file=0
 mem=1
 db=2