MediaWiki

Popups configuration error

MediaWiki is unable to load the extension Popups. Please check that the extension's name is correct and all of its files are properly installed.

Details:
Error reading /home/unklewik/public_html/extensions/Popups/extension.json. filemtime(): stat failed for /home/unklewik/public_html/extensions/Popups/extension.json.

#0 /home/unklewik/public_html/includes/GlobalFunctions.php(74): ExtensionRegistry->queue()
#1 /home/unklewik/public_html/LocalSettings.php(153): wfLoadExtensions()
#2 /home/unklewik/public_html/includes/Setup.php(212): require_once('/home/unklewik/...')
#3 /home/unklewik/public_html/includes/WebStart.php(92): require_once('/home/unklewik/...')
#4 /home/unklewik/public_html/index.php(44): require('/home/unklewik/...')
#5 {main}

Fatal error: Error Loading extension. Unable to open file /home/unklewik/public_html/extensions/Popups/extension.json: filemtime(): stat failed for /home/unklewik/public_html/extensions/Popups/extension.json in /home/unklewik/public_html/includes/registration/MissingExtensionException.php on line 100