Please I'm facing the error below, what may be the cause:

SQLSTATE[HY000] [2002] phpnetworkgetaddresses: getaddrinfo for mysql.railway.internal failed: Name or service not known (Connection: mysql, SQL: select tablename as name, (datalength + indexlength) as size, tablecomment as comment, engine as engine, tablecollation as collation from informationschema.tables where tableschema = 'railway' and tabletype in ('BASE TABLE', 'SYSTEM VERSIONED') order by table_name)

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