Theme hook jplayer not found

Before the last update the module seems to work fine. Unfortunately all of a sudden it doesn't work, probably caused by the update. The following logs were found:

Log #1

Location: ../file/ajax/field_audio/und/0/form-xnhlXVG7ZkY1E7KHHRHmC6unxDe2DaJ9sS2iLTQ-TYw
Referrer: ../node/651/edit
Message: Theme hook jplayer not found

Log #2

Location: ../file/ajax/field_audio/und/0/form-xnhlXVG7ZkY1E7KHHRHmC6unxDe2DaJ9sS2iLTQ-TYw
Referrer: ../node/651/edit
Message: Notice: Undefined index: items in audiofield_jplayer() (regel 317 van ../sites/all/modules/audiofield/audiofield.players.inc).

Log #3

Location: ../file/ajax/field_audio/und/0/form-xnhlXVG7ZkY1E7KHHRHmC6unxDe2DaJ9sS2iLTQ-TYw
Referrer: ../node/651/edit
Message: Notice: Undefined index: instance in audiofield_jplayer() (regel 316 van ../sites/all/modules/audiofield/audiofield.players.inc).

Log #4

Location: ../file/ajax/field_audio/und/0/form-xnhlXVG7ZkY1E7KHHRHmC6unxDe2DaJ9sS2iLTQ-TYw
Referrer: ../node/651/edit
Message: Notice: Undefined index: entity in audiofield_jplayer() (regel 315 van ../sites/all/modules/audiofield/audiofield.players.inc).

Log #5

Location: ../file/ajax/field_audio/und/0/form-xnhlXVG7ZkY1E7KHHRHmC6unxDe2DaJ9sS2iLTQ-TYw
Referrer: ../node/651/edit
Message: Notice: Undefined index: entity_type in audiofield_jplayer() (regel 314 van ../sites/all/modules/audiofield/audiofield.players.inc).

This is what is shown on "../file/ajax/field_audio/und/0/form-xnhlXVG7ZkY1E7KHHRHmC6unxDe2DaJ9sS2iLTQ-TYw"

[{"command":"settings","settings":{"basePath":"\/","pathPrefix":"","ajaxPageState":{"theme":"mytheme","theme_token":"77MUP0ZQrRYvDO3s4qIpphj14zEvUQfgKO80fIGUUxA"}},"merge":true},{"command":"insert","method":"replaceWith","selector":null,"data":"\u003Cdiv class=\u0022messages error\u0022\u003E\n\u003Ch2 class=\u0022element-invisible\u0022\u003EFoutmelding\u003C\/h2\u003E\nEr is een fout opgetreden. Het bestand dat werd ge\u00fcpload is waarschijnlijk groter dan de maximum toegestane bestandsgrootte (8 MB).\u003C\/div\u003E\n","settings":null}]

And this is what is on the lines mentioned in the logs (../sites/all/modules/audiofield/audiofield.players.inc):

function audiofield_jplayer($player_path, $audio_file, $options) {
  return theme(
    'jplayer',
    array(
      'entity_type' => $options['entity_type'], //line 314
      'entity' => $options['entity'], //line 315
      'field_name' => $options['instance']['field_name'], //line 316
      'items' => $options['items'], //line 317
      'settings' => array(
    'autoplay' => 0,
    'solution' => 'html, flash',
    'preload' => 'metadata',
    'volume' => 80,
    'muted' => FALSE,
    'repeat' => 'none',
    'backgroundColor' => '000000',
    'mode' => 'playlist',
  ),
    )
  );
}

What happens at the interface is the following. After selecting a file and hitting the upload button, the field only shows the remove button. When saving the node, the field shows nothing at view mode.