Server-side logging is not working - log file not created

calling Server-side logging in the ‘Error Handling and Logging dhtmlx page’, is not working, no file is created.

Tis is my servlet code:

gc.enable_log(“temp.log”,true);
LogManager.getInstance().log(“OT”);
gc.render_table(“TCiudades”,“PK_TCiudades_csCodigoCiudad”,“csCodigoCiudad,csDescripcionCiudad,csTipoRiesgo”);

is there an error in server side java connector, is not running ? who creates the log ?