Site library does not load

Hello,

I’m having trouble accessing the site library because “It seems there is a configuration issue with your server that’s causing the import to fail”. Does anyone know if/how I can fix this? The below error code was shown:

[08/Mar/2020:13:08:10] (a?1???): WordPress Instance Info:
[08/Mar/2020:13:08:10] (a?1???): Home URL : https://praktijkderivier.nl
[08/Mar/2020:13:08:10] (a?1???): Site URL : https://praktijkderivier.nl
[08/Mar/2020:13:08:10] (a?1???): WordPress Version : 5.3.2
[08/Mar/2020:13:08:10] (a?1???): Onboarding Version : 1.8.2
[08/Mar/2020:13:08:10] (a?1???): Multisite : No
[08/Mar/2020:13:08:10] (a?1???): Server Info : Apache/2.4.41 (Ubuntu)
[08/Mar/2020:13:08:10] (a?1???): PHP Version : 7.4.3
[08/Mar/2020:13:08:10] (a?1???): HTTPS : No
[08/Mar/2020:13:08:10] (a?1???): PHP Max Execution Time : 300
[08/Mar/2020:13:08:10] (a?1???): PHP Max Input Vars : 6000
[08/Mar/2020:13:08:10] (a?1???): Max Upload Size : 134217728
[08/Mar/2020:13:08:10] (a?1???): Plugins:
[08/Mar/2020:13:08:10] (a?1???): [PLUGIN] Elementor : v2.9.4 (Elementor.com)
[08/Mar/2020:13:08:10] (a?1???): [PLUGIN] Elementor – Header, Footer & Blocks : v1.3.0 (Brainstorm Force, Nikhil Chavan)
[08/Mar/2020:13:08:10] (a?1???): [PLUGIN] NavMenu Addon For Elementor : v1.1.6 (ThemeIsle)
[08/Mar/2020:13:08:10] (a?1???): [PLUGIN] Sticky Header Effects for Elementor : v1.3.2 (Rwattner)
[08/Mar/2020:13:08:10] (a?1???): [PLUGIN] Varnish HTTP Purge Xel Media : v3.8.1-xel (Mika Epstein, Samy Ascha)
[08/Mar/2020:13:08:10] (a?1???): [PLUGIN] WP Maintenance Mode : v2.2.4 (Designmodo)
[08/Mar/2020:13:08:10] (a?1???): [PLUGIN] WPForms Lite : v1.5.9.1 (WPForms)