I am also receiving the same error. I found out by using the Include option and playing around that there appears to be a limit of 9 labels on the account. If you Include the labels <9 at a time, it works.
I am also receiving the same error.
I found out by using the Include option and playing around that there appears to be a limit of 9 labels on the account.
If you Include the labels <9 at a time, it works.