I tried uploading my game archive and received the following error:

An AJAX HTTP request terminated abnormally.
Debugging information follows.
Path: /file/ajax/field_art_files/und/form-8Jkf1DikiN4Mvt8hN5LZENtgEIcKQmk7m93NuA3RHZg
StatusText: n/a
ResponseText:
Liberated Pixel Cup
Error         
Error message
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'node_form' not found or invalid function name in drupal_retrieve_form() (line 795 of
/var/www/sites/opengameart/includes/form.inc).
Notice: Trying to get property of non-object in comment_form_node_form_alter() (line 1210 of /var/www/sites/opengameart/modules/comment/comment.module).
Notice: Trying to get property of non-object in menu_form_node_form_alter() (line 629 of /var/www/sites/opengameart/modules/menu/menu.module).
Notice: Trying to get property of non-object in menu_form_node_form_alter() (line 630 of /var/www/sites/opengameart/modules/menu/menu.module).
Notice: Trying to get property of non-object in pathauto_form_node_form_alter() (line 433 of /var/www/sites/opengameart/sites/all/modules/pathauto/pathauto.module).
EntityMalformedException: Missing bundle property on entity of type node. in entity_extract_ids() (line 7539 of /var/www/sites/opengameart/includes/common.inc).
The website encountered an unexpected error. Please try again later.     

ReadyState: undefined

Then I tried saving and received this error:

EntityMalformedException: Missing bundle property on entity of type node. in entity_extract_ids() (line 7539 of /var/www/sites/opengameart/includes/common.inc).

If it didn't go through in some way or another, what should my next steps be?