Unable to print logs

[MyCheaperDomain dotCom]

Hello,

1. xml:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd" >
<suite name="TestAll" parallel = "tests" thread-count = "2">


 
 <test name="postivelogintest_IE">
 <parameter name="browser" value="ie"/>
 
 <classes>
 <class name="com.dice.LoginTest">
 <methods>
 <include name="DataDrivenpositiveLoginTest"/>
 </methods>
 </class>
 </classes>
 </test>
 
 
 <test name="postivelogintest_CH">
 <parameter name="browser" value="ch"/>
 
 <classes>
 <class name="com.dice.LoginTest">
 <methods>
 <include name="DataDrivenpositiveLoginTest"/>
 </methods>
 </class>
 </classes>
 </test>
 
 
</suite>

2. BaseTest

package com.diceBase;
import org.apache.log4j.Logger;
import org.openqa.selenium.WebDriver;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Parameters;




public class BaseTest {
 protected WebDriver driver;
 protected Logger log;
 
    @Parameters ({"browser"})
 @BeforeMethod
 protected void MethodSetup(String browser){
 log.info("method set up"); // line 16
 driver = BrowserFactory.getDriver(browser);
 }
 
 @AfterMethod
 protected void TearDown(){
 log.info("method tear down");


 try {
 Thread.sleep(5000);
 driver.quit();
 } catch (Exception e) {
 }
 }
}

3. I added log4j.properties under src/main/resources. Please see image.

4. In the basetest, I added two lines after importing log4j. 

 log.info("method set up"); 

 log.info("method tear down");

5. I only imported log4j logger in basetest class to see if it works. If works then I can import log4j entire project.

I get error if I keep both log messages. But, If I remove both log messages, script passes. 

 Why am I getting the error?