Can't build Snap

I can’t seem to build the snap installer for my app.
Here is the config file -

Build log error -

I don’t have any input on why your snap failed to build.

However: could you use what you have as description as the summary, and perhaps the text from zulip’s homepage (“Zulip combines the immediacy of Slack with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.”) as the description?