Call to undefined function Illuminate\Encryption\openssl_decrypt()

composer install

didn't fix the problem, but the following does:

composer update

Modify php.ini and enable openssl extension in you php environment.

To find php installation path, run below command in terminal or cmd

php --ini

Output something like below:

Configuration File (php.ini) Path: C:\Windows
Loaded Configuration File:         C:\php-7.3.8\php.ini
Scan for additional .ini files in: (none)
Additional .ini files parsed:      (none)

here mine is Loaded Configuration File is C:\php-7.3.8\php.ini

open php.ini with any editor using vim, nano, notepad++ or any editor.

find extension=openssl remove ;

from ;extension=openssl to extension=openssl

save and restart server.

If you have shut XAMPP down and restarted it, it may be worth running the composer install command again, or simply running composer update to ensure that all dependancies are being loaded correctly.

Just edit php.ini file and uncomment by removing ";" before this line --extension=openssl. in php.ini file. and it will start working properly.