Leaky Paywall Does Not Work

This plugin does not seem to work on one of my blogs. Nothing happens. Just simply nothing whatsoever happens. It may be related to the server settings or something like that because it seems to work on another server run by a different company. In any case, I got the following error message. Do you have any idea why this is happening and how I might be able to fix it? Thank you.

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[Tue Jun 21 08:33:25.080719 2016] [fcgid:warn] [pid 66306] [client 218.217.102.104:53553] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 64, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:33:25.080763 2016] [fcgid:warn] [pid 66306] [client 218.217.102.104:53553] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 76, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:33:25.080770 2016] [fcgid:warn] [pid 66306] [client 218.217.102.104:53553] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 78, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:33:25.080776 2016] [fcgid:warn] [pid 66306] [client 218.217.102.104:53553] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 91, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:33:40.267212 2016] [fcgid:warn] [pid 64766] [client 218.217.102.104:53695] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 64, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=430&action=edit
[Tue Jun 21 08:33:40.267242 2016] [fcgid:warn] [pid 64766] [client 218.217.102.104:53695] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 76, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=430&action=edit
[Tue Jun 21 08:33:40.267248 2016] [fcgid:warn] [pid 64766] [client 218.217.102.104:53695] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 78, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=430&action=edit
[Tue Jun 21 08:33:40.267253 2016] [fcgid:warn] [pid 64766] [client 218.217.102.104:53695] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line , referer: https://www.hidamarinikki.com/wp-admin/post.php?post=430&action=edit
[Tue Jun 21 08:33:40.269620 2016] [fcgid:warn] [pid 64766] [client 218.217.102.104:53695] mod_fcgid: stderr: 91, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=430&action=edit
[Tue Jun 21 08:42:40.066809 2016] [fcgid:warn] [pid 103723] [client 218.217.102.104:55786] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 64, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:42:40.066842 2016] [fcgid:warn] [pid 103723] [client 218.217.102.104:55786] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 76, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:42:40.066849 2016] [fcgid:warn] [pid 103723] [client 218.217.102.104:55786] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 78, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:42:40.066855 2016] [fcgid:warn] [pid 103723] [client 218.217.102.104:55786] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 91, referer: https://www.hidamarinikki.com/wp-admin/edit.php
[Tue Jun 21 08:43:03.286088 2016] [fcgid:warn] [pid 91554] [client 218.217.102.104:55848] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 64, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=441&action=edit
[Tue Jun 21 08:43:03.286124 2016] [fcgid:warn] [pid 91554] [client 218.217.102.104:55848] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 76, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=441&action=edit
[Tue Jun 21 08:43:03.286130 2016] [fcgid:warn] [pid 91554] [client 218.217.102.104:55848] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 78, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=441&action=edit
[Tue Jun 21 08:43:03.286136 2016] [fcgid:warn] [pid 91554] [client 218.217.102.104:55848] mod_fcgid: stderr: PHP Warning: in_array() expects parameter 2 to be array, null given in /home/rico/hidamarinikki.com/public_html/wp-content/plugins/leaky-paywall/metaboxes.php on line 91, referer: https://www.hidamarinikki.com/wp-admin/post.php?post=441&action=edit

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