500 errores me salen

Hola,

Veo que hay un archivo de registro que indica la existencia de errores 500 en alguna web alojada en mi cuenta de Hosting, me pueden ayudar a solucionarlo?.
He reinstalado wp cache ya que me lo recomendaban ustedes y necesito 2 cosas: 1.- solucionar estos errores. 2.- optimizar la configuración del plugin.

Estos son los errores:

[09-Nov-2016 17:17:34 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:17:43 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:18:13 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:19:47 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:32:07 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:32:12 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:36:13 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:36:14 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113
[09-Nov-2016 17:39:53 UTC] PHP Fatal error: Call to undefined function wp_cache_get() in /home/decoraci/public_html/abelcampos/wp-includes/option.php on line 1113

gracias!

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