diff --git a/src/main/Main.java b/src/main/Main.java
index 2b1798b..7ac2177 100644
--- a/src/main/Main.java
+++ b/src/main/Main.java
@@ -12,8 +12,8 @@
 				new TestLogoutPOSTCactus("h41ZoL44toLq3Kg7B1aXreHjcjluAsoyz8DezqiXJ28s1atiGR5UHFOqi7Or3xOD"),
 				new TestPUTCactus("f", "f"), new TestDELETECactus("qF9bgKYZmw8P") };
 		TestYouTube[] youtube = { new TestGETYouTube(token), new TestPOSTYouTube(token), new TestPUTYouTube(token),
-				new TestDELETEYouTube(token, "PLCwNa5MZdBSq_3K5-MV0x6luKXskvqrKk") };
-		cactus[0].start();
+				new TestDELETEYouTube(token, "PLCwNa5MZdBSrIn-8nc9gDckf2kzXejtL_") };
+		youtube[3].start();
 	}
 
 }
diff --git a/src/restfulchecker/RestChecker.java b/src/restfulchecker/RestChecker.java
index 3645b47..b63ea79 100644
--- a/src/restfulchecker/RestChecker.java
+++ b/src/restfulchecker/RestChecker.java
@@ -200,11 +200,11 @@
 	}
 
 	public String jsonRemove(String JsonString, RemoveJsonParam param) {
-		if (JsonString == null) {
-			return "";
-		}
 		try {
 			JsonNode json = new ObjectMapper().readTree(JsonString);
+			if(json == null) {
+				return "";
+			}
 			if (json.getClass() != ArrayNode.class) {
 				jsonRemove(json, param);
 			} else {
diff --git a/src/testcase/youtube/TestPOSTYouTube.java b/src/testcase/youtube/TestPOSTYouTube.java
index 53963bd..746749d 100644
--- a/src/testcase/youtube/TestPOSTYouTube.java
+++ b/src/testcase/youtube/TestPOSTYouTube.java
@@ -10,7 +10,7 @@
 
 	public TestPOSTYouTube(String token) {
 		super(token);
-		check.jsonAcquisition("src/testcase/post.json");
+		check.jsonAcquisition("src/testcase/youtube/post.json");
 		check.setProperty("Content-type", "application/json");
 		check.getResourceParam().setPathParams("playlists");
 		check.getResourceParam().setQueryParams(new RestParam("mine", "true"));
diff --git a/src/testcase/youtube/TestPUTYouTube.java b/src/testcase/youtube/TestPUTYouTube.java
index 414781d..371294e 100644
--- a/src/testcase/youtube/TestPUTYouTube.java
+++ b/src/testcase/youtube/TestPUTYouTube.java
@@ -10,7 +10,7 @@
 
 	public TestPUTYouTube(String token) {
 		super(token);
-		check.jsonAcquisition("src/testcase/put.json");
+		check.jsonAcquisition("src/testcase/youtube/put.json");
 		check.setProperty("Content-type", "application/json");
 		check.getResourceParam().setPathParams("playlists");
 		check.getResourceParam().setQueryParams(new RestParam("mine", "true"));
diff --git a/src/testcase/youtube/put.json b/src/testcase/youtube/put.json
index 9e493f1..5623e45 100644
--- a/src/testcase/youtube/put.json
+++ b/src/testcase/youtube/put.json
@@ -1,5 +1,5 @@
 {
-	"id": "PLCwNa5MZdBSq_3K5-MV0x6luKXskvqrKk",
+	"id": "PLCwNa5MZdBSrrBniob6HbbxFx85AcUJh8",
 	"snippet": {
 		"title": "eee"
 	}