Whenever I try to save any changes to the default WCF theme, I get the following error on the 'Package Identifier' field:
[Blocked Image: https://i.gyazo.com/77528d4ba27f358f109a93fd2f303cdf.png]
The package identifiers cannot begin with “com.woltlab.”.
As far as I am aware, this is the default setting and I have not changed the identifier in any way.
Edit: This issue seems similar to this.