When I tried to zap within the TSP group I got this error. I was able to switch wallets and successfully zapped. 
Discussion
are you trying to deposit sats to your ecash wallet?
No. I chose my bluewallet but got that error trying to zap 42 sats to someone in an 0xchat group. I backed out to my settings and chose a different wallet and it went through. Or, it looked like it did. No error at least and a small measage below the persons post that a zap was sent.
Do you care to send us a direct message in order to assist?