1 exception(s): Exception #0 (Exception): Notice: Undefined offset: 2 in /var/www/html/Registration/vendor/magento/framework/Encryption/Encryptor.php on line 588
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what is your php version? – Shoaib Munir Aug 6 '19 at 6:26
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Is that comes after upgrading or after installation of new Magento? Which Magento version you are using? – Harsh Jayswal Aug 6 '19 at 6:28
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@ShoaibMunir php version is 7.2 – usman Aug 6 '19 at 6:29
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@HarshJayswal i am using magento 2.3. i am working on Extension devolpment. when i install magento 2.3 everything is working fine. but now admin login is not working but admin login page is displayed but when i enter login credential it gave me exception of undefined index .i have also tried it on php version 7.1 but facing the same exception – usman Aug 6 '19 at 6:31
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Your environment is using ARGON2ID13 instead of SHA256 for hashing.
Check if you have 'sodium' php extension enabled.
If you disable the libsodium php extension, it will fallback on SHA-256 and won't break Magento.
In the Docker php-fpm image you can comment it out in /usr/local/etc/php/conf.d/docker-php-ext-sodium.ini:
;extension=sodium.so
answered Aug 6 '19 at 6:32
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the senerio is i devolped extension on magento 2.3 and for testing of extension i insall magento 2.2.9 and extension behave excellent but after tesing when i want to login on magento 2.3 admin pannel it gave me this exception.does it resolved by installing sodium extension? – usman Aug 6 '19 at 6:40
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Check this one: github.com/magento/magento2/issues/23511#issuecomment-507033705 – Shoaib Munir Aug 6 '19 at 6:48
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i have read this issue on provided link but here only describe its a PHP version issue but its not a PHP issue because i have have checked it by change PHP version – usman Aug 6 '19 at 9:10
ok got your problem just create a new admin user using the following command
bin/magento admin:user:create
after that login with new admin id it will solve your problem.
