Solution of the error when opening wp-admin after the update

I noticed somehow when upgrading WordPress to version 4.7 that after the update wp-admin does not open, instead of the admin window there is an empty window and in the address bar of the browser the following address:

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Solution PHP Notice: Use of undefined constant x — assumed ‘x’

I once noticed the following notification when writing a PHP script:

PHP Notice:  Use of undefined constant uid - assumed 'uid' in /scripts/file.php on line 31
PHP Notice:  Use of undefined constant value - assumed 'value' in /scripts/file.php on line 32

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