Error when trying to send document

I've had my account for years and have never had any issues. Today, I tried to send a document to be signed and I received this message below. I thought I had a limit of 5 per month for my subscription. This would have been the first one this month. Can you help? 

Error:

You cannot send new agreements because you don't have sufficient transactions available in your account. Please contact your administrator

Thanks in advance!