Duplicate Please enter an ID using only a-z, A-Z, 0-9, and _ characters.

[AndyB]

As of XenForo v1.4 beta 3 I'm not able to install my Calendar add-on located here:

https://xenforo.com/community/resources/calendar.2675/

During the "Install New Add-on" procedure I click the Install Add-on button and I get the following message:

Please enter an ID using only a-z, A-Z, 0-9, and _ characters.

At first I thought the XML file name was the issue, but even if i rename the file to Calendar.xml the problem persists.

 

[Jeremy]

Check your IDs in your add-on, it is caused by invalid keys.

https://xenforo.com/community/threads/bug-or-cause-by-recent-update.81344/#post-813887

 

[Chris D]

Template Modification keys must be alphanumeric and underscore. No spaces or other special characters.