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<b>Warning</b>:  Undefined variable $lang in <b>/home/medresponsive/public_html/free-unlimited-sitemap-generator/core/controllers/facebook.php</b> on line <b>5</b><br />
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<b>Warning</b>:  Trying to access array offset on value of type null in <b>/home/medresponsive/public_html/free-unlimited-sitemap-generator/core/controllers/facebook.php</b> on line <b>5</b><br />
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<b>Fatal error</b>:  Uncaught Facebook\Exceptions\FacebookSDKException: Required &quot;app_id&quot; key not supplied in config and could not find fallback environment variable &quot;FACEBOOK_APP_ID&quot; in /home/medresponsive/public_html/free-unlimited-sitemap-generator/core/library/facebook/Facebook.php:139
Stack trace:
#0 /home/medresponsive/public_html/free-unlimited-sitemap-generator/core/controllers/facebook.php(32): Facebook\Facebook-&gt;__construct(Array)
#1 /home/medresponsive/public_html/free-unlimited-sitemap-generator/core/app.php(182): require('/home/medrespon...')
#2 /home/medresponsive/public_html/free-unlimited-sitemap-generator/index.php(24): require('/home/medrespon...')
#3 {main}
  thrown in <b>/home/medresponsive/public_html/free-unlimited-sitemap-generator/core/library/facebook/Facebook.php</b> on line <b>139</b><br />