diff --git a/src/main/debugger/org/bdware/sc/debugger/DebugMain.java b/src/main/debugger/org/bdware/sc/debugger/DebugMain.java
index 8ce15f1..4a22409 100644
--- a/src/main/debugger/org/bdware/sc/debugger/DebugMain.java
+++ b/src/main/debugger/org/bdware/sc/debugger/DebugMain.java
@@ -63,7 +63,9 @@ public class DebugMain {
                 = new ResultCallback() {
             @Override
             public void onResult(String str) {
-
+                if(str.contains("Error")) {
+                    LOGGER.error("Some error happens: " + str);
+                }
                 LOGGER.info("[PrintCB] " + str);
             }
         };
diff --git a/src/main/java/org/bdware/sc/compiler/AnnotationProcessor.java b/src/main/java/org/bdware/sc/compiler/AnnotationProcessor.java
index f356f71..816b12a 100644
--- a/src/main/java/org/bdware/sc/compiler/AnnotationProcessor.java
+++ b/src/main/java/org/bdware/sc/compiler/AnnotationProcessor.java
@@ -10,7 +10,7 @@ public abstract class AnnotationProcessor {
     }
 
     public void processFunction(
-            AnnotationNode anno, ContractNode contractNode, FunctionNode functionNode) {
+            AnnotationNode anno, ContractNode contractNode, FunctionNode functionNode) throws Exception {
         return;
     }
 }
diff --git a/src/main/java/org/bdware/sc/compiler/YJSCompiler.java b/src/main/java/org/bdware/sc/compiler/YJSCompiler.java
index 11cd2c6..beb2517 100644
--- a/src/main/java/org/bdware/sc/compiler/YJSCompiler.java
+++ b/src/main/java/org/bdware/sc/compiler/YJSCompiler.java
@@ -188,7 +188,7 @@ public class YJSCompiler {
         return czb;
     }
 
-    public ContractNode compile(InputStream input, String fileName) throws IOException {
+    public ContractNode compile(InputStream input, String fileName) throws Exception {
         // 词法分析
         JavaScriptLexer lexer = new JavaScriptLexer(new ANTLRInputStream(input));
         lexer.setUseStrictDefault(true);
@@ -208,7 +208,7 @@ public class YJSCompiler {
         return contract;
     }
 
-    private void handleAnnotation(ContractNode contractNode) {
+    private void handleAnnotation(ContractNode contractNode) throws Exception {
         for (AnnotationNode node : contract.annotations) {
             AnnotationProcessor processor = findProcessor(node);
             if (processor != null) {
diff --git a/src/main/java/org/bdware/sc/compiler/ap/DOOP.java b/src/main/java/org/bdware/sc/compiler/ap/DOOP.java
index 4697fa6..0e254b5 100644
--- a/src/main/java/org/bdware/sc/compiler/ap/DOOP.java
+++ b/src/main/java/org/bdware/sc/compiler/ap/DOOP.java
@@ -13,7 +13,7 @@ import org.bdware.sc.node.FunctionNode;
 // DOOP is designed for DoipModule which contains specific functions for RepositoryHandler
 public class DOOP extends AnnotationProcessor {
     @Override
-    public void processFunction(AnnotationNode anno, ContractNode contractNode, FunctionNode functionNode) {
+    public void processFunction(AnnotationNode anno, ContractNode contractNode, FunctionNode functionNode) throws Exception {
         // 通过DOOP注解，解析对应的值，并放进对应的FunctionNode中
         // 注解必须暴露出来昂！！！
         functionNode.setIsExport(true);
diff --git a/src/main/java/org/bdware/sc/handler/DOOPRequestHandler.java b/src/main/java/org/bdware/sc/handler/DOOPRequestHandler.java
index 7ab064e..0ed220f 100644
--- a/src/main/java/org/bdware/sc/handler/DOOPRequestHandler.java
+++ b/src/main/java/org/bdware/sc/handler/DOOPRequestHandler.java
@@ -16,7 +16,6 @@ import org.bdware.sc.bean.ContractRequest;
 import org.bdware.sc.boundry.JavaScriptEntry;
 import org.bdware.sc.entity.DoipMessagePacker;
 import org.bdware.sc.node.FunctionNode;
-import org.bdware.sc.util.JsonUtil;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -41,8 +40,12 @@ public class DOOPRequestHandler implements DoipRequestHandler, RepositoryHandler
         return instance;
     }
 
-    public void addDoipOperation(FunctionNode function) {
-        doipFunctionNodeMap.put(function.getDoipOperationInfo().operationName, function);
+    public void addDoipOperation(FunctionNode function) throws Exception {
+        String operationName = function.getDoipOperationInfo().operationName;
+        if (doipFunctionNodeMap.containsKey(operationName)) {
+            throw new Exception("Contract is wrong: One DO operation maps multiple functions");
+        }
+        doipFunctionNodeMap.put(operationName, function);
     }
 
     @Override
diff --git a/src/test/java/org/bdware/sc/parser/YJSParserTest.java b/src/test/java/org/bdware/sc/parser/YJSParserTest.java
index 1f7ac9c..9e62db9 100644
--- a/src/test/java/org/bdware/sc/parser/YJSParserTest.java
+++ b/src/test/java/org/bdware/sc/parser/YJSParserTest.java
@@ -67,7 +67,7 @@ public class YJSParserTest {
             ContractNode cn = compiler.compile(resource, "rrr.yjs");
             new DesktopEngine();
             System.out.println(new Gson().toJson(cn));
-        } catch (IOException e) {
+        } catch (Exception e) {
             e.printStackTrace();
         }
     }