Error: Use of undefined constant ENVIRONMENT - CI 4.1.5

The following is the "PHP stack trace" for the same error in case it helps.

Code:

PHP Stack trace:
PHP  1. {main}() /var/www/xyz.com/spark:0
PHP  2. require() /var/www/xyz.com/spark:44
PHP  3. CodeIgniter\Config\Services::codeigniter() /var/www/xyz.com/vendor/codeigniter4/framework/system/bootstrap.php:145
PHP  4. CodeIgniter\Config\BaseService::getSharedInstance() /var/www/xyz.com/vendor/codeigniter4/framework/system/Config/Services.php:134
PHP  5. CodeIgniter\Config\Services::codeigniter() /var/www/xyz.com/vendor/codeigniter4/framework/system/Config/BaseService.php:189
PHP  6. config() /var/www/xyz.com/vendor/codeigniter4/framework/system/Config/Services.php:137
PHP  7. CodeIgniter\Config\Factories::config() /var/www/xyz.com/vendor/codeigniter4/framework/system/Common.php:198
PHP  8. CodeIgniter\Config\Factories::__callStatic() /var/www/xyz.com/vendor/codeigniter4/framework/system/Common.php:198