undefined property codeigniter

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Si estas iniciandote en codeigniter 2.1.0 y php 5, tengo algunos consejos como por ejemplo cuando practicaba el ejemplo tutorial de la pagina de codeigniter, no me gusta copiar y pegar, asi que empeze a tipear y entender lo que codeo, probe la parte de news pero nada me salia este error:



me pase casi 6 horas buscando el error, queria preguntar en stackoverflow pero me pedian usuario, pregunte a mi jefe de desarrollo por chat y nada, entonces solo cambie el '_construct' por: '__construct' no parece a simple vista pero es importante, aparte de las otras recomendaciones si pones enn config/autoload.php, en libraries=array('database'), si funciona, suerte espero haber ayudado

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