This same error is being reported on the mediafront module page https://drupal.org/node/2055543#comment-7934751. We have gotten various iterations of this error (metatag, quicktab) and the above mentioned mediafront. So I am going with the common denominator of token, and reporting this here.

Notice: Undefined index: commerce_file in _token_field_info() (line 1334 of /home/drupco5/public_html/bethlehem/htdocs/sites/all/modules/contrib/token/token.tokens.inc). Backtrace:

_token_field_info() token.tokens.inc:1360
field_token_info_alter(Array, NULL, NULL, NULL) module.inc:1063
drupal_alter('token_info', Array) token.inc:261
token_info() token.module:507
token_get_info() entity_token.tokens.inc:176
entity_token_tokens('node', Array, Array, Array)
call_user_func_array('entity_token_tokens', Array) module.inc:857
module_invoke_all('tokens', 'node', Array, Array, Array) token.inc:178
token_generate('node', Array, Array, Array) token.inc:87
token_replace('[node:title] | [site:name]', Array, Array) metatag.inc:111
DrupalTextMetaTag->getValue(Array) metatag.inc:162
DrupalTitleMetaTag->getElement(Array) metatag.module:770
metatag_metatags_view('node:basic_page', Array, Array) metatag.module:715
metatag_entity_view(Object, 'node', 'full', 'en')
call_user_func_array('metatag_entity_view', Array) module.inc:857
module_invoke_all('entity_view', Object, 'node', 'full', 'en') node.module:1454
node_build_content(Object, 'full', 'en') node.module:1343
node_view(Object, 'full', NULL) node.module:2676
node_view_multiple(Array, 'full') node.module:1478
node_show(Object) node.module:2760
node_page_view(Object)
call_user_func_array('node_page_view', Array) menu.inc:517
menu_execute_active_handler() index.php:21