Anki Forums

Error: tag needs a service attribute

I get the following error (see debug information below) during review. I can’t tell if this error occurred in the previous version of Anki as I mostly use a mobile version for reviews. It never occurred in versions earlier than the previous one:

This tag needs a 'service' attribute:
 <div id="wrapper" style="text-align: center">
  <div id="centered" style="display: inline-block;">
   to collaps
  kbd {
    box-shadow: inset 0 1px 0 0 white;
        left top,
        left bottom,
        color-stop(0.05, #f9f9f9),
        color-stop(1, #e9e9e9)
    background-color: #f9f9f9;
    border-radius: 4px;
    border: 1px solid gainsboro;
    display: inline-block;
    font-size: 15px;
    height: 15px;
    line-height: 15px;
    padding: 4px 4px;
    margin: 5px;
    text-align: center;
    text-shadow: 1px 1px 0 white;
    cursor: pointer;
    cursor: hand;
  .nightMode kbd {
    color: black;
 <script type="text/javascript">
  function ct_click(tag) {
    pycmd("ct_click_" + tag)
  function ct_dblclick(tag, deck) {
    pycmd("ct_dblclick_" + tag + "|" + deck)

Debug information;

Anki 2.1.34 (8af8f565) Python 3.8.0 Qt 5.15.1 PyQt 5.15.1
Platform: Mac 10.15.6
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2020-09-29 11:07:39

===Add-ons (active)===
(add-on provided name [Add-on folder, installed at, version, is config changed])
Add Table ['1237621971', 2020-07-25T14:19, 'None', mod]
Advanced Browser ['874215009', 2020-04-23T00:45, 'None', '']
AnkiWebView Inspector ['31746032', 2019-05-03T00:43, 'None', '']
AwesomeTTS - Add speech to your flashcards ['1436550454', 2020-09-01T15:59, 'None', '']
BetterTags ['bettertags', 2020-04-28T17:40, 'None', mod]
Clickable Tags v11 ['380714095', 2020-03-22T14:56, 'None', '']
Cloze Overlapper ['cloze_overlapper', 2019-02-01T13:37, 'None', '']
Customize Sidebar ['1988760596', 2020-01-15T22:01, 'None', mod]
Image Occlusion Enhanced for Anki 21 alpha ['1374772155', 2020-04-28T04:21, 'None', '']
Mini Format Pack ['295889520', 2019-09-26T18:02, 'None', '']
Progress Graphs and Stats for Learned and Matured Cards ['266436365', 2020-03-29T08:26, 'None', '']
Resize images in editor ['1103084694', 2020-08-02T15:04, 'None', mod]
Review Heatmap ['review_heatmap', 2020-04-30T15:23, 'None', '']
Search Everywhere - Ctrl+F Find ['search_everywhere', 2020-03-31T22:13, 'None', '']

===IDs of active AnkiWeb add-ons===
1103084694 1237621971 1374772155 1436550454 1988760596 266436365 295889520 31746032 380714095 874215009

===Add-ons (inactive)===
(add-on provided name [Add-on folder, installed at, version, is config changed])
Auto Markdown ['1030875226', 2019-09-13T21:21, 'None', '']

Thanks for help!