Duplicator not working – throws error like “ssl not enabled” – Cloudflare SSL

Hello,

So, I’ve been trying for a long time to get this plugin to work for my website.
In the beginning I contacted my Webhoster, they looked into my limits and raised them all.
However this didnt solve it. After some more discussions, the Webhoster recieved acces to my WordPress and had a deep look into my WordPress. After running Duplicator, he told me that the Plugins throws error like “ssl not enabled”.
This was his original message:
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Hello,

Please note that the plugin throws error like “ssl not enabled”. We assume that this is happening due to the SSL installed in the cloudflare. Could you please contact the “duplicator” plugin support let them know the belolw error details:

++
** Really Simple SSL debug mode **
** Detecting configuration **,
plugin version: 2.3.14, referer
Already on SSL, start detecting configuration,
No server variable detected
ssl type: LOADBALANCER,
ssl not enabled, show notice
++

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Message END

After the failed Package Build, I recieve this error:

Server Status: 500 -Internal Server Error
Error Message:
Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at webmaster@xs-sol.com to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

And this is the Error log:

********************************************************************************
PACKAGE-LOG: 2016-10-17 14:05:09
********************************************************************************
VERSION: 1.1.18
WORDPRESS: 4.6.1
PHP INFO: 5.5.38 | SAPI: cgi-fcgi
SERVER: Apache
PHP TIME LIMIT: (0) no time limit imposed
PHP MAX MEMORY: 2048M (256M default)
MEMORY STACK: 16.5MB

********************************************************************************
DATABASE:
********************************************************************************
BUILD MODE: MYSQLDUMP
MYSQLTIMEOUT: 5000
MYSQLDUMP: Is Supported
FILTERED: []
RESPONSE: Ran from /***/***/mysqldump
TABLES: total:65 | filtered:0 | create:65
SQL CREATED: backup_20_09_2016_5804da7d933671770161017140445_database.sql
SQL FILE SIZE: 31.43MB (32952699)
SQL FILE TIME: 2016-10-17 14:05:50
SQL RUNTIME: 41.10 sec.

********************************************************************************
ARCHIVE (ZIP):
********************************************************************************
ARCHIVE DIR: /***e/x*****m/p*****ml/x***l
ARCHIVE FILE: backup_20_09_2016_5804da7d933671770161017140445_archive.zip
FILTERS: *OFF*
DIRS: not set
EXTS: not set
—————————————-
COMPRESSING
SIZE: 296.74MB
STATS: Dirs 1,854 | Files 11,472
SQL ADDED: backup_20_09_2016_5804da7d933671770161017140445_database.sql
Items archived [2854] flushing response.
Items archived [3855] flushing response.
Items archived [4856] flushing response.
Items archived [5857] flushing response.
Items archived [6858] flushing response.
Items archived [7859] flushing response.
Items archived [8860] flushing response.
Items archived [9861] flushing response.
Items archived [10862] flushing response.