Warnings on activating Wp PGP Encrypted emails

Hi im having problems setting up a secure email from my webste contact form.

On activating ‘Wp PGP Encrypted Emails’ I get the following warnings

Warning: Invalid argument supplied for foreach() in /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/wp-content/plugins/wp-pgp-encrypted-emails/vendor/singpolyma/openpgp-php/lib/openpgp.php on line 1425

Warning: Invalid argument supplied for foreach() in /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/wp-content/plugins/wp-pgp-encrypted-emails/vendor/singpolyma/openpgp-php/lib/openpgp.php on line 1447

Warning: Invalid argument supplied for foreach() in /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/wp-content/plugins/wp-pgp-encrypted-emails/vendor/singpolyma/openpgp-php/lib/openpgp.php on line 1425

Warning: Invalid argument supplied for foreach() in /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/wp-content/plugins/wp-pgp-encrypted-emails/vendor/singpolyma/openpgp-php/lib/openpgp.php on line 1447

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/[redacted]/htdocs/clickandbuilds/Welcome/wp-content/plugins/wp-pgp-encrypted-emails/vendor/singpolyma/openpgp-php/lib/openpgp.php:1425) in /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/wp-admin/includes/misc.php on line 1310

Warning: Cannot modify header information – headers already sent by (output started at /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/wp-content/plugins/wp-pgp-encrypted-emails/vendor/singpolyma/openpgp-php/lib/openpgp.php:1425) in /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/wp-admin/admin-header.php on line 9

### Begin System Info (Generated 2022-01-10 09:35:05) ###
———— SITE INFO
Site URL: [redacted]
Home URL: [redacted]
Multisite: No

———— USER BROWSER
Platform: Windows
Browser Name: Firefox
Browser Version: 95.0

———— WORDPRESS CONFIG
WP Version: 5.8.3
Language: en_GB
Permalink Structure: /%postname%/
Active Theme: Customizr 4.4.20
Show On Front: page
Page On Front: Home (#191)
Page For Posts: Unset
ABSPATH: /homepages/41/[redacted]/htdocs/clickandbuilds/[redacted]/
WP_DEBUG: Disabled
WP Memory Limit: 40MB

———— NIMBLE CONFIGURATION
Version: 3.1.32
Upgraded From: None
Started With: 3.1.32

———— MU PLUGINS
1&1 Product Subdomain: 1.1.0

———— WP ACTIVE PLUGINS
Advanced Editor Tools (previously TinyMCE Advanced): 5.6.0
Antispam Bee: 2.10.0
Broken Link Checker: 1.11.16
IONOS Assistant: 7.1.4
Kadence Blocks – Gutenberg Blocks for Page Builder Features: 2.1.19
Limit Login Attempts Reloaded: 2.23.2
Nimble Page Builder: 3.1.32
Real Cookie Banner (Free): 2.12.0
Statify: 1.8.3
The GDPR Framework: 1.0.48
WPForms Lite: 1.7.2
WP PGP Encrypted Emails: 0.8.0

———— WP INACTIVE PLUGINS
Cookies and Content Security Policy: 1.99

———— WEBSERVER CONFIG
PHP Version: 7.4.25
MySQL Version: 5.5.5
Webserver Info: Apache
Write/Read permissions: OK

———— PHP CONFIG
Memory Limit: 1024M
Upload Max Size: 128M
Post Max Size: 128M
Upload Max Filesize: 128M
Time Limit: 30
Max Input Vars: 1000
Display Errors: On (1)
PHP Arg Separator: &
PHP Allow URL File Open: 1

### End System Info ###