Why do I keep getting this error??

Oops! There was an issue with updating your invoice. Please try again.
Error: Oops! There was an issue saving this invoice. Please try again later.
1
Oops! There was an issue with updating your invoice. Please try again.
Error: Oops! There was an issue saving this invoice. Please try again later.
Comments
same thing happening to me
I'm having the same issue. posted here
https://community.waveapps.com/discussion/12876/oops-there-was-an-issue-with-approving-your-draft-please-try-again