Where to specify a constant for netcat?

Question

MySQL

Hello, there is an error when trying to open the zvpm.org
site. What could be the problem? Below is the response from those hosting support.
If you need to set a constant, then where?)

The connection parameters are correct and the connection to the database with this data is successful:

mysql -hlocalhost -uMYUSER -pMYPASS MYDB
Reading table information for completion of table and column names
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Your MariaDB connection id is 2929211
Server version: 10.1.38-MariaDB-0+deb9u1 Debian 9.8

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MariaDB [MYDB]>

The site's web server logs contain warnings about the NETCAT_ERROR_DB_CONNECT constant not set:

[Sat Apr 04 18:20:31.659730 2020] [fcgid:warn] [pid 14487] [client 5.45.114.4:41048] mod_fcgid: stderr: PHP Warning: Use of undefined constant NETCAT_ERROR_DB_CONNECT - assumed 'NETCAT_ERROR_DB_CONNECT' (this will throw an Error in a future version of PHP) in /var/www/fastuser/data/www/zvpm.org/netcat/system/nc_core.class.php on line 236