Cannot send invoice in free version

Hey there,

Thanks for creating such a great product. I love using it for my dancing academy.

I ran into a problem with the invoices. I grabbed a video of the screen when I attempt to send an invoice https://take.ms/M9iPU. Am I doing something wrong? I normally did this and it worked but it stopped working from Thursday last week.

I'd appreciate any guidance. And my apologies in advance if I'm misusing the forums for support-like queries, it's just that I didn't find any other area to do this and feeling a bit desperate since I haven't been able to send invoices anymore :/