Getting PHP header/script errors occasionally

Hi! My website is http://www.lakewoodwindsorparke.com, (hosted by google because my client didn’t want to pay me for my dedicated server…) and when I have your plugin turned on (right now it is off) and people try to log in to the site, they occasionally get the following message:

‘Missing chkafrica /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/modules/countries/chkafrica.php

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations-new.php:378) in /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-includes/pluggable.php on line 918

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations-new.php:378) in /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-includes/pluggable.php on line 919

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations-new.php:378) in /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-includes/pluggable.php on line 920

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations-new.php:378) in /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-includes/pluggable.php on line 918

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations-new.php:378) in /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-includes/pluggable.php on line 919

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations-new.php:378) in /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-includes/pluggable.php on line 920

Warning: Cannot modify header information – headers already sent by (output started at /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-content/plugins/stop-spammer-registrations-plugin/stop-spammer-registrations-new.php:378) in /home/content/p3pnexwpnas08_data03/17/2481517/html/wp-includes/pluggable.php on line 1178′

Thanks in advance!
GC

https://wordpress.org/plugins/stop-spammer-registrations-plugin/