Sorcerer subclass necessary class features error

I have read on several threads where others were having trouble with this (as was I). I have checked the forum and found information where it stated the level for sorcerers was 1,6,14,18. However, after researching more, it was changed to 3,6,14,18, After changing this for my homebrew subclass. I no longer received the error message. Hopes this helps others out. 

Quote from VickiAnngelo >>

I have read on several threads where others were having trouble with this (as was I). I have checked the forum and found information where it stated the level for sorcerers was 1,6,14,18. However, after researching more, it was changed to 3,6,14,18, After changing this for my homebrew subclass. I no longer received the error message. Hopes this helps others out. 

The correct levels for the 5e Sorcerer class are 1, 6, 14, 18. The correct levels for the 5.5e version are 3, 6, 14, 18 (as all classes get their subclass selection at level 3 in 5.5e). You need to use the set of levels that match the version of the class you're creating the subclass for.

It's also worth pointing out, for anyone else who might be having this issue, that D&D Beyond has a long history of breaking this feature once every few months or so, causing bugs where the thing that's checking for subclass feature levels flags a subclass as invalid even when the correct levels for the class are used. When this happens, sometimes putting in a dummy feature at level 1 helps, and sometimes it doesn't and you need to wait for them to fix it.