My site cant run higher than 5.6 php cause of REAL AES

WHen I try to check out, right where it calculates UPS costs I get 500 error blank page and this error is in log file

[02-Jan-2021 03:55:20 Europe/Paris] PHP Fatal error: Uncaught Exception: AES: Mcrypt is selected as encryption implementation but is unavailable. in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module:293
Stack trace:
#0 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(214): mcrypt_module_open_safe('rijndael-128', '', 'MCRYPT_MODE_CBC', '')
#1 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(117): aes_decrypt_old('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...', false, NULL, NULL, NULL, NULL)
#2 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(272): aes_decrypt('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...')
#3 /home/ww/public_html/sites/all/modules/commerce_ups/includes/commerce_ups.xml.inc(31): commerce_ups_decrypt_vars(true)
#4 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(80): commerce_ups_build_rate_request(Object(stdClass))
#5 /home/ww/public_html/profiles/commerce_kickstart/modules/contrib/commerce_shipping/commerce_ship in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module on line 293
[02-Jan-2021 03:55:22 Europe/Paris] PHP Fatal error: Uncaught Exception: AES: Mcrypt is selected as encryption implementation but is unavailable. in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module:293
Stack trace:
#0 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(214): mcrypt_module_open_safe('rijndael-128', '', 'MCRYPT_MODE_CBC', '')
#1 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(117): aes_decrypt_old('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...', false, NULL, NULL, NULL, NULL)
#2 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(272): aes_decrypt('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...')
#3 /home/ww/public_html/sites/all/modules/commerce_ups/includes/commerce_ups.xml.inc(31): commerce_ups_decrypt_vars(true)
#4 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(80): commerce_ups_build_rate_request(Object(stdClass))
#5 /home/ww/public_html/profiles/commerce_kickstart/modules/contrib/commerce_shipping/commerce_ship in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module on line 293
[02-Jan-2021 03:55:24 Europe/Paris] PHP Fatal error: Uncaught Exception: AES: Mcrypt is selected as encryption implementation but is unavailable. in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module:293
Stack trace:
#0 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(214): mcrypt_module_open_safe('rijndael-128', '', 'MCRYPT_MODE_CBC', '')
#1 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(117): aes_decrypt_old('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...', false, NULL, NULL, NULL, NULL)
#2 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(272): aes_decrypt('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...')
#3 /home/ww/public_html/sites/all/modules/commerce_ups/includes/commerce_ups.xml.inc(31): commerce_ups_decrypt_vars(true)
#4 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(80): commerce_ups_build_rate_request(Object(stdClass))
#5 /home/ww/public_html/profiles/commerce_kickstart/modules/contrib/commerce_shipping/commerce_ship in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module on line 293
[02-Jan-2021 03:55:26 Europe/Paris] PHP Fatal error: Uncaught Exception: AES: Mcrypt is selected as encryption implementation but is unavailable. in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module:293
Stack trace:
#0 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(214): mcrypt_module_open_safe('rijndael-128', '', 'MCRYPT_MODE_CBC', '')
#1 /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module(117): aes_decrypt_old('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...', false, NULL, NULL, NULL, NULL)
#2 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(272): aes_decrypt('m\xE4\xC4p_B\x01i\xF1\xCD\x02\xD2\xE3\x17\x1F...')
#3 /home/ww/public_html/sites/all/modules/commerce_ups/includes/commerce_ups.xml.inc(31): commerce_ups_decrypt_vars(true)
#4 /home/ww/public_html/sites/all/modules/commerce_ups/commerce_ups.module(80): commerce_ups_build_rate_request(Object(stdClass))
#5 /home/ww/public_html/profiles/commerce_kickstart/modules/contrib/commerce_shipping/commerce_ship in /home/ww/public_html/sites/all/modules/real_aes/aes/aes.module on line 293

can you help with this, I dont know what to do here

What to do?