Problemas plantilla según stephan error 500  

Stephan me dice que tengo los siguientes errores que generan errores 500.
Estos errores los puedo ignorar porque son cortes momentaneos o hay que entender el por qué pasan?
El template es original.

[07-Feb-2017 13:54:01 UTC] PHP Fatal error: Uncaught Error: Call to undefined function get_header() in /home/unitrips/public_html/unitrips-wp/wp-content/themes/lovetravel_new/archive.php:1
[08-Feb-2017 13:02:52 UTC] PHP Fatal error: Out of memory (allocated 8388608) (tried to allocate 8192 bytes) in /home/unitrips/public_html/unitrips-wp/wp-includes/post.php on line 66
[08-Feb-2017 15:59:32 UTC] PHP Fatal error: Out of memory (allocated 41943040) (tried to allocate 32768 bytes) in /home/unitrips/public_html/unitrips-wp/wp-content/plugins/wpml-string-translation/inc/package-translation/inc/wpml-package-translation.class.php on line 571
[08-Feb-2017 15:59:32 UTC] PHP Fatal error: Out of memory (allocated 54525952) (tried to allocate 32768 bytes) in /home/unitrips/public_html/unitrips-wp/wp-content/themes/lovetravel_new/framework/sample/extensions/metaboxes/extension_metaboxes.php on line 1303
[08-Feb-2017 15:59:32 UTC] PHP Fatal error: Out of memory (allocated 39845888) (tried to allocate 32768 bytes) in /home/unitrips/public_html/unitrips-wp/wp-content/plugins/wpml-media/inc/wpml-media.class.php on line 1298
[08-Feb-2017 15:59:32 UTC] PHP Fatal error: Out of memory (allocated 27262976) (tried to allocate 16384 bytes) in /home/unitrips/public_html/unitrips-wp/wp-content/plugins/sitepress-multilingual-cms/inc/functions.php on line 237

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