Skrill PHP error

Good day
have installed and configured Skrill today. Unfortunately, the Qury Editor always gives an error message: PHP error – Undefined index: wp-content / plugins / official-skrill-woocommerce / class-skrill-payment-gateway.php: 543

MY WP Status:
`
### wp-core ###

version: 5.2.4
site_language: de_DE
user_language: de_DE
permalink: /%postname%/
https_status: true
user_registration: 0
default_comment_status: open
multisite: false
user_count: 3
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /www/htdocs/w019cd3b/jamb-xxl.ch
wordpress_size: 58,00 MB (60815010 bytes)
uploads_path: /www/htdocs/w019cd3b/jamb-xxl.ch/wp-content/uploads
uploads_size: 10,14 GB (10888273875 bytes)
themes_path: /www/htdocs/w019cd3b/jamb-xxl.ch/wp-content/themes
themes_size: 20,06 MB (21035984 bytes)
plugins_path: /www/htdocs/w019cd3b/jamb-xxl.ch/wp-content/plugins
plugins_size: 162,09 MB (169962409 bytes)
database_size: 238,71 MB (250308365 bytes)
total_size: 10,61 GB (11390395643 bytes)

### wp-dropins (2) ###

advanced-cache.php: true
db.php: true

### wp-active-theme ###

name: Woodmart Child
version: 1.0.0
author: XTemos
author_website: https://xtemos.com
parent_theme: Woodmart
theme_features: woocommerce, wc-product-gallery-zoom, post-thumbnails, post-formats, automatic-feed-links, title-tag, menus, editor-style, widgets
theme_path: /www/htdocs/w019cd3b/jamb-xxl.ch/wp-content/themes/woodmart

### wp-themes (1) ###

Woodmart: version: 4.1.0, author: XTemos

### wp-plugins-active (22) ###

BackWPup: version: 3.6.10, author: Inpsyde GmbH
Classic Editor: version: 1.5, author: WordPress Contributors
Code Snippets: version: 2.13.3, author: Code Snippets Pro
Contact Form 7: version: 5.1.4, author: Takayuki Miyoshi
Enable Media Replace: version: 3.3.6, author: ShortPixel
EWWW Image Optimizer: version: 5.1.1, author: Exactly WWW
Loco Translate: version: 2.3.1, author: Tim Whitlock
Query Monitor: version: 3.4.0, author: John Blackbourn
Regenerate Thumbnails: version: 3.1.1, author: Alex Mills (Viper007Bond)
Safe SVG: version: 1.9.4, author: Daryll Doyle
Server IP & Memory Usage Display: version: 2.1.0, author: Apasionados, Apasionados del Marketing
Skrill – WooCommerce: version: 1.0.30, author: Skrill
VidaXL for WooCommerce: version: 1.1.7, author: Woosa
WooCommerce: version: 3.7.1, author: Automattic
WooCommerce Admin: version: 0.20.1, author: WooCommerce
WooCommerce PayPal Checkout Gateway: version: 1.6.17, author: WooCommerce
Woodmart Core: author: (undefined), version: 1.0.19
WPBakery Page Builder: version: 6.0.5, author: Michael M – WPBakery.com
WP Mail SMTP: version: 1.7.0, author: WPForms
WP Real Media Library: version: 4.5.4, author: Matthias Günter
WP Rocket: version: 3.4.0.5, author: WP Media
Yoast SEO: version: 12.3, author: Team Yoast

### wp-plugins-inactive (6) ###

Envato Elements: version: 1.1.3, author: Envato
Envato Market: version: 2.0.3, author: Envato
PW WooCommerce Bulk Edit: version: 2.61, author: Pimwick, LLC
Slider Revolution: version: 6.1.3, author: ThemePunch
WooCommerce Product Feed: version: 3.1.41, author: WebAppick
WooCommerce Services: version: 1.21.1, author: Automattic

### wp-media ###

image_editor: EWWWIO_Imagick_Editor
imagick_module_version: 1673
imagemagick_version: ImageMagick 6.8.9-9 Q16 x86_64 2019-06-15 https://www.imagemagick.org
gd_version: bundled (2.1.0 compatible)
ghostscript_version: 9.26

### wp-server ###

server_architecture: Linux 4.15.0-65-generic x86_64
httpd_software: Apache
php_version: 7.3.6-nmm1 64bit
php_sapi: fpm-fcgi
max_input_variables: 10000
time_limit: 600
memory_limit: 512M
max_input_time: 60
upload_max_size: 200M
php_post_max_size: 200M
curl_version: 7.47.0 OpenSSL/1.0.2g
suhosin: false
imagick_availability: true
htaccess_extra_rules: true

### wp-database ###

extension: mysqli
server_version: 5.7.26-nmm1-log
client_version: mysqlnd 5.0.12-dev – 20150407 – $Id: 7cc7cc96e675f6d72e5cf0f267f48e167c2abb23 $

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /www/htdocs/w019cd3b/jamb-xxl.ch/wp-content
WP_PLUGIN_DIR: /www/htdocs/w019cd3b/jamb-xxl.ch/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 512M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: true
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable

Many thanks for your help

The page I need help with: [log in to see the link]