Adding playlist wont work

I tried adding a playlist with less than 300 videos. AFAIK under 300 should be okay but it wont let me, still says it has to be less than 300

You can’t add items to any playlist or just a specific one? Send me the link to your room to an i’ll have a look.

Well im trying to add a WHOLE playlist which is 299 vids all together. Ill send you a mail