diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
index 9bb54aa..236a65b 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
@@ -909,8 +909,8 @@
      *
      * @param currentContext current context in the parsed tree.
      */
-    void enterInstanceIdentifierSpecification(GeneratedYangParser.InstanceIdentifierSpecificationContext
-                                              currentContext);
+    void enterInstanceIdentifierSpecification(
+            GeneratedYangParser.InstanceIdentifierSpecificationContext currentContext);
 
     /**
      * Exit a parse tree produced by GeneratedYangParser for grammar rule
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
index 187c600..c0c128b 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
@@ -16,6 +16,8 @@
 
 package org.onosproject.yangutils.parser.impl;
 
+import java.util.Stack;
+
 import org.antlr.v4.runtime.ParserRuleContext;
 import org.antlr.v4.runtime.tree.ErrorNode;
 import org.antlr.v4.runtime.tree.TerminalNode;
@@ -23,20 +25,19 @@
 import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangListener;
 import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
-
+import org.onosproject.yangutils.parser.impl.listeners.BaseFileListener;
+import org.onosproject.yangutils.parser.impl.listeners.BelongsToListener;
+import org.onosproject.yangutils.parser.impl.listeners.ConfigListener;
+import org.onosproject.yangutils.parser.impl.listeners.ContactListener;
+import org.onosproject.yangutils.parser.impl.listeners.ContainerListener;
 import org.onosproject.yangutils.parser.impl.listeners.DefaultListener;
+import org.onosproject.yangutils.parser.impl.listeners.DescriptionListener;
+import org.onosproject.yangutils.parser.impl.listeners.ImportListener;
+import org.onosproject.yangutils.parser.impl.listeners.IncludeListener;
 import org.onosproject.yangutils.parser.impl.listeners.KeyListener;
 import org.onosproject.yangutils.parser.impl.listeners.LeafListListener;
 import org.onosproject.yangutils.parser.impl.listeners.LeafListener;
 import org.onosproject.yangutils.parser.impl.listeners.ListListener;
-import org.onosproject.yangutils.parser.impl.listeners.ContainerListener;
-import org.onosproject.yangutils.parser.impl.listeners.ConfigListener;
-import org.onosproject.yangutils.parser.impl.listeners.ContactListener;
-import org.onosproject.yangutils.parser.impl.listeners.BaseFileListener;
-import org.onosproject.yangutils.parser.impl.listeners.BelongsToListener;
-import org.onosproject.yangutils.parser.impl.listeners.DescriptionListener;
-import org.onosproject.yangutils.parser.impl.listeners.ImportListener;
-import org.onosproject.yangutils.parser.impl.listeners.IncludeListener;
 import org.onosproject.yangutils.parser.impl.listeners.MandatoryListener;
 import org.onosproject.yangutils.parser.impl.listeners.MaxElementsListener;
 import org.onosproject.yangutils.parser.impl.listeners.MinElementsListener;
@@ -54,9 +55,6 @@
 import org.onosproject.yangutils.parser.impl.listeners.TypeListener;
 import org.onosproject.yangutils.parser.impl.listeners.UnitsListener;
 import org.onosproject.yangutils.parser.impl.listeners.VersionListener;
-import org.onosproject.yangutils.parser.impl.parserutils.ListenerError;
-
-import java.util.Stack;
 
 /**
  * ANTLR generates a parse-tree listener interface that responds to events
@@ -72,9 +70,6 @@
     // Parse tree root node
     private YangNode rootNode;
 
-    // Maintains the state of Exception.
-    private ListenerError errorInformation = new ListenerError();
-
     /**
      * Returns stack of parsable data.
      *
@@ -85,15 +80,6 @@
     }
 
     /**
-     * Returns error information.
-     *
-     * @return error information object having exception flag and message
-     */
-    public ListenerError getErrorInformation() {
-        return errorInformation;
-    }
-
-    /**
      * Returns root node.
      *
      * @return rootNode of data model tree.
@@ -120,15 +106,6 @@
         this.rootNode = rootNode;
     }
 
-    /**
-     * Set listener error information.
-     *
-     * @param errorInformation error occurred during tree walk.
-     */
-    public void setErrorInformation(ListenerError errorInformation) {
-        this.errorInformation = errorInformation;
-    }
-
     @Override
     public void enterYangfile(GeneratedYangParser.YangfileContext ctx) {
         BaseFileListener.processYangFileEntry(this, ctx);
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListener.java
index 9c951ae..49c0348 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListener.java
@@ -59,15 +59,14 @@
     }
 
     /**
-     * It is called when parser receives an input matching the grammar
-     * rule (config), performs validation and updates the data model
-     * tree.
+     * It is called when parser receives an input matching the grammar rule
+     * (config), performs validation and updates the data model tree.
      *
      * @param listener listener's object.
      * @param ctx context object of the grammar rule.
      */
     public static void processConfigEntry(TreeWalkListener listener,
-                                             GeneratedYangParser.ConfigStatementContext ctx) {
+            GeneratedYangParser.ConfigStatementContext ctx) {
         boolean isConfig = false;
 
         // Check for stack to be non empty.
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
index 9d41253..d2f90ce 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
@@ -56,26 +56,27 @@
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.parser.ParsableDataType;
-import static org.onosproject.yangutils.parser.ParsableDataType.TYPEDEF_DATA;
-import static org.onosproject.yangutils.parser.ParsableDataType.UNITS_DATA;
-import static org.onosproject.yangutils.parser.ParsableDataType.DEFAULT_DATA;
-import static org.onosproject.yangutils.parser.ParsableDataType.TYPE_DATA;
-import static org.onosproject.yangutils.parser.ParsableDataType.DESCRIPTION_DATA;
-import static org.onosproject.yangutils.parser.ParsableDataType.REFERENCE_DATA;
-import static org.onosproject.yangutils.parser.ParsableDataType.STATUS_DATA;
 import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
 import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.onosproject.yangutils.parser.ParsableDataType.DEFAULT_DATA;
+import static org.onosproject.yangutils.parser.ParsableDataType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.parser.ParsableDataType.REFERENCE_DATA;
+import static org.onosproject.yangutils.parser.ParsableDataType.STATUS_DATA;
+import static org.onosproject.yangutils.parser.ParsableDataType.TYPEDEF_DATA;
+import static org.onosproject.yangutils.parser.ParsableDataType.TYPE_DATA;
+import static org.onosproject.yangutils.parser.ParsableDataType.UNITS_DATA;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_CARDINALITY;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
 
 /**
@@ -115,8 +116,8 @@
 
         Parsable curData = listener.getParsedDataStack().peek();
 
-        if (curData instanceof YangModule | curData instanceof YangSubModule | curData instanceof YangContainer
-                | curData instanceof YangList) {
+        if ((curData instanceof YangModule) | (curData instanceof YangSubModule) | (curData instanceof YangContainer)
+                | (curData instanceof YangList)) {
             /*
              * TODO YangGrouping, YangRpc, YangInput, YangOutput, Notification.
              */
@@ -150,7 +151,6 @@
         if (listener.getParsedDataStack().peek() instanceof YangTypeDef) {
             listener.getParsedDataStack().pop();
         } else {
-            listener.getErrorInformation().setErrorFlag(true);
             throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, TYPEDEF_DATA,
                     ctx.IDENTIFIER().getText(), EXIT));
         }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerError.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerError.java
deleted file mode 100644
index c5c3c8b..0000000
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerError.java
+++ /dev/null
@@ -1,107 +0,0 @@
-/*
- * Copyright 2016 Open Networking Laboratory
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.onosproject.yangutils.parser.impl.parserutils;
-
-/**
- * Error information while doing a listener's based walk is maintained in it.
- */
-public class ListenerError {
-
-    // Maintains the state of exception.
-    private boolean errorFlag = false;
-
-    // Maintains the reason of exception.
-    private String errorMsg;
-
-    // Maintains the line number of exception.
-    private int lineNumber;
-
-    // Maintains the character position in lin of exception.
-    private int charPositionInLine;
-
-    /**
-     * Returns error flag.
-     *
-     * @return error flag.
-     */
-    public boolean isErrorFlag() {
-        return errorFlag;
-    }
-
-    /**
-     * Returns reason for error.
-     *
-     * @return error message
-     */
-    public String getErrorMsg() {
-        return errorMsg;
-    }
-
-    /**
-     * Returns error line number.
-     *
-     * @return error line number.
-     */
-    public int getLineNumber() {
-        return lineNumber;
-    }
-
-    /**
-     * Returns error position in line.
-     *
-     * @return error character position in line.
-     */
-    public int getCharPositionInLine() {
-        return charPositionInLine;
-    }
-
-    /**
-     * Set error flag.
-     *
-     * @param errorFlag error existence flag.
-     */
-    public void setErrorFlag(boolean errorFlag) {
-        this.errorFlag = errorFlag;
-    }
-
-    /**
-     * Set error message.
-     *
-      * @param errorMsg reason for error.
-     */
-    public void setErrorMsg(String errorMsg) {
-        this.errorMsg = errorMsg;
-    }
-
-    /**
-     * Set error line number.
-     *
-     * @param lineNumber line number of error.
-     */
-    public void setLineNumber(int lineNumber) {
-        this.lineNumber = lineNumber;
-    }
-
-    /**
-     * Set error character position in line.
-     *
-     * @param charPositionInLine error character position in line.
-     */
-    public void setCharPositionInLine(int charPositionInLine) {
-        this.charPositionInLine = charPositionInLine;
-    }
-}
\ No newline at end of file