Uploaded to server but get error message

Hi, I have finally finished working locally with my site and I have uploaded it to webgo.de servers. I have not added the licence key to the domain associated with my account, so I guess this is my first question: How do I do this and is this why I am getting this error?

This page is currently offline. We are very sorry for the inconvenience and will fix it as soon as possible.

Advice for developers and administrators:
Change the PHP version to 7.3, 7.4 or 8.0 (PHP 7.4 is recommended)

No, the pending license does not cause this kind of error.
Have you thought about uploading your htaccess with the rest of the files?

Hi Yes I have uploaded htaccess with the files, I have been locally running this server. So maybe I would need to edit this file?

# Kirby .htaccess
# revision 2020-06-15

# rewrite rules
<IfModule mod_rewrite.c>

# enable awesome urls. i.e.:
# http://yourdomain.com/about-us/team
RewriteEngine on

# make sure to set the RewriteBase correctly
# if you are running the site in a subfolder;
# otherwise links or the entire site will break.
# If your homepage is http://yourdomain.com/mysite,
# set the RewriteBase to:
# RewriteBase /mysite

# In some environments it's necessary to
# set the RewriteBase to:
# RewriteBase /

# block files and folders beginning with a dot, such as .git
# except for the .well-known folder, which is used for Let's Encrypt and security.txt
RewriteRule (^|/)\.(?!well-known\/) index.php [L]

# block all files in the content folder from being accessed directly
RewriteRule ^content/(.*) index.php [L]

# block all files in the site folder from being accessed directly
RewriteRule ^site/(.*) index.php [L]

# block direct access to Kirby and the Panel sources
RewriteRule ^kirby/(.*) index.php [L]

# make site links work
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*) index.php [L]


# pass the Authorization header to PHP
SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1

# compress text file responses
<IfModule mod_deflate.c>
AddOutputFilterByType DEFLATE text/plain
AddOutputFilterByType DEFLATE text/html
AddOutputFilterByType DEFLATE text/css
AddOutputFilterByType DEFLATE text/javascript
AddOutputFilterByType DEFLATE application/json
AddOutputFilterByType DEFLATE application/javascript
AddOutputFilterByType DEFLATE application/x-javascript

The error message means what it says. Check your PHP version, you need at least 7.3

@pixelijn Is this something I would need to do via webgo?

What is webgo?

@pixelijn - Yes I had to change it there. Hosting provider, and it fixed the issue.