title: Headers already sent by Warning in WordPress DashBoard
body: <p>Can't understand the reason, everything was working fine a week ago but suddenly the following Warning Messages when calling wp-admin shows a blank screen no option to enter login details and the 2 following messages.</p>
  
  <pre><code>Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-includes/pluggable.php on line 896
  </code></pre>
  
  <p>When I try calling wp-login.php then comes the following error message</p>
  
  <pre><code>Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-login.php on line 415
  
  Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-login.php on line 427
  </code></pre>
  
  <p>While calling url as wp-login.php there shows login screen but after entering login details it shows the following warning messages</p>
  
  <pre><code>Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-login.php on line 415
  
  Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-login.php on line 427
  
  Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-includes/pluggable.php on line 678
  
  Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-includes/pluggable.php on line 679
  
  Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-includes/pluggable.php on line 680
  
  Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/wp-content/plugins/js_composer/composer/lib/composer.php:1) in /home/username/public_html/wp-includes/pluggable.php on line 896
  </code></pre>
  
  <p>I tried commenting all headers lines in this warnings but still no use.</p>
  
  <p>Any help is appreciated.</p>