Error: no prekey for contact, device 1

[GoCyberEd]

I had this running perfectly in docker for some time. Recently (not sure exactly when, a few months) I've been getting the following error when trying to send a message:

Error: no prekey for contact +15555555555, device 1

The phone number is a valid phone number (not all 5s). I have removed it for privacy reasons. I do get a warning during launch that contacts.yml is not present. Is this related?

If it matters, I'm using this for a method of 2FA in NextCloud.

Edit:
I have tried the rekey command. It returned successful, but I get the same error about a missing prekey when attempting to send a message.

[morph027]

Hi. Yes, this seems to happen due to some changes in signal protocol, see here: signal-golang/textsecure#31

There's still being worked on.

[morph027]

Also, the project has been moved: https://gitlab.com/morph027/signal-web-gateway

[teutat3s]

Same happened here today - suddenly a long running instance of this nice signal-gateway showed a very similar error:

Error: no prekey for contact +15555555555, device 3

It there a known workaround to make it work for now?

EDIT: If the projects new home is GitLab, maybe we should move this issue over and close it here?

[teutat3s]

For me with the latest build v1.2.14 of https://github.com/signal-golang/textsecure the no prekey for contact error is gone