Elementor not loading

Hi dears,
first of all: I am a total rookie regarding webdesign and programming,
but Elementor is just great!

I finished my website using Elementor the last days. However, since today, the page isn’t loading anymore: I just see the “loading-E” – and nothing happens.

I already googled for about two hours, tried several things (like enabling Beta-Modus, enhancing memory, deleting cookies, removing cache…), but nothing works.

Can you please take a look?

See my system info below.
Thank you from Germany ??

== Server Environment ==
Operating System: Linux
Software: Apache/2.4.29
MySQL version: 5.6.19
PHP Version: 7.1.15
PHP Max Input Vars: 1000
PHP Max Post Size: 8M
GD Installed: Yes
Write Permissions: All right
Elementor Library: Connected

== WordPress Environment ==
Version: 4.9.4
Site URL: https://www.dasduell.net
Home URL: https://www.dasduell.net
WP Multisite: No
Max Upload Size: 2 MB
Memory limit: 256M
Permalink Structure: Plain
Language: de-DE
Timezone: Europe/Berlin
Debug Mode: Inactive

== Theme ==
Name: Astra
Version: 1.2.2
Author: Brainstorm Force
Child Theme: No

== User ==
Role: administrator
WP Profile lang: de_DE
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0

== Active Plugins ==
Elementor
Version: 2.0.1
Author: Elementor.com

WPForms Lite
Version: 1.4.4.1
Author: WPForms

== Debug ==
Errors:
TypeError: this.getRegion(…) is undefined
at https://www.dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88051
2018-03-27 20:22 +00:00
x 13 times

SecurityError: Permission denied to access property “elementorFrontend” on cross-origin object
at https://dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:0
2018-03-27 20:04 +00:00

TypeError: this.getRegion(…) is undefined
at https://dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88051
2018-03-27 20:03 +00:00
x 2 times

TypeError: this.getRegion(…) is undefined
at https://www.dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88051
2018-03-27 19:56 +00:00

TypeError: Unable to get property ‘currentView’ of undefined or null reference
at https://www.dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88044
2018-03-27 19:50 +00:00
x 2 times

TypeError: this.getRegion(…) is undefined
at https://www.dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88051
2018-03-27 19:46 +00:00

TypeError: this.getRegion(…) is undefined
at https://www.dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88051
2018-03-27 19:46 +00:00
x 6 times

TypeError: Cannot read property ‘currentView’ of undefined
at https://www.dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88074
2018-03-27 19:38 +00:00

TypeError: this.getRegion(…) is undefined
at https://www.dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:88051
2018-03-27 19:38 +00:00

SecurityError: Permission denied to access property “elementorFrontend” on cross-origin object
at https://dasduell.net/wp-content/plugins/elementor/assets/js/editor.min.js?ver=2.0.1 – 2:0
2018-03-27 19:30 +00:00
x 4 times