Is it no longer updated? I have the following errors:

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<b>Warning</b>: file_get_contents(): https:// wrapper is disabled in the server configuration by allow_url_fopen=0 in <b>/home/jiwoo/public_html/wp-content/plugins/wp-admin-theme/wp-admin-theme-options.php</b> on line <b>28</b><br />
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<b>Warning</b>: file_get_contents(https://jiwoo.itpr.co.kr/wp-content/plugins/wp-admin-theme/wp-admin.css): failed to open stream: no suitable wrapper could be found in <b>/home/jiwoo/public_html/wp-content/plugins/wp-admin-theme/wp-admin-theme-options.php</b> on line <b>28</b><br />