You are trying to use the locale (en) which your PHP installation does not support

De Wikillano

En la version de dotproject 2.0.1 de serie, nos encontramos que los gŕaficos gantt para las tareas no funionan, este es un pequeño parche,

\lib\jpgraph\src\jpgraph.php

añadir el texto en negrita:

Code:

function Set($aLocale) {

$query = "SELECT 'config_value' FROM 'config' WHERE 'config_name = host_locale'";
$aLocale = mysql_query ($query);

if ( in_array($aLocale, array_keys($this->iDayAbb)) ){
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