You may be using one theme as the MyBB Master Style theme.
So what should I do? It says the parent of the theme is the master theme but there.. is NO master theme. There is just this one.
Delete the other one? And, I think it looks good that way. I'm just saying.
Hello,
Just remove one theme and keep the wanted one.
Also, you may want to put the copyrights back for that theme. It was made by Justin S.
Regards,
George.