[Calisthenics]

The warning from the community compiler is very clear:

pawn Code:

warning 213: tag mismatch: expected tag none ("_"), but found "MySQL"

It expected:

pawn Code:

new SQL;

but found:

pawn Code:

new MySQL: SQL;

The connection handle until R39 did not have the MySQL: tag so it included an older version. Try opening the script through the editor.