<br />
<b>Warning</b>:  compact(): Undefined variable $groupby in <b>/home/roopikar/dhpoco/wp-includes/class-wp-site-query.php</b> on line <b>538</b><br />
<br />
<b>Fatal error</b>:  Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, first array member is not a valid class name or object in /home/roopikar/dhpoco/wp-content/plugins/jetpack/jetpack.php:3938
Stack trace:
#0 /home/roopikar/dhpoco/wp-content/plugins/jetpack/jetpack.php(4607): Jetpack_Sync::sync_options('/home/roopikar/...', 'widget_twitter')
#1 /home/roopikar/dhpoco/wp-settings.php(268): include_once('/home/roopikar/...')
#2 /home/roopikar/dhpoco/wp-config.php(101): require_once('/home/roopikar/...')
#3 /home/roopikar/dhpoco/wp-load.php(37): require_once('/home/roopikar/...')
#4 /home/roopikar/dhpoco/wp-blog-header.php(13): require_once('/home/roopikar/...')
#5 /home/roopikar/dhpoco/index.php(17): require('/home/roopikar/...')
#6 {main}
  thrown in <b>/home/roopikar/dhpoco/wp-content/plugins/jetpack/jetpack.php</b> on line <b>3938</b><br />