zat theme preview error

[renarsvilnis]

Hi,
I'm having an issue getting local theme preview working on an existing theme (v1).
I tried specifying api_version: 1 in manifest.json as in this #325 PR code.

Credentials are valid, tested with other API requests.

zat theme preview
Warning: unexpected string encoding: US-ASCII, zat runs best in UTF-8.
Please set the RUBYOPT environment variable to "-E utf-8".
  Generating  Generating theme from local files
  Generating  OK
   Uploading  Uploading theme
   Uploading  Failed: the server responded with status 400
       Error  assets L:: Mapping has more items than allowed.
== Sinatra (v1.4.8) has taken the stage on 4567 for development with backup from Thin
Thin web server (v1.7.2 codename Bachmanity)
Maximum connections set to 1024
Listening on localhost:4567, CTRL+C to stop

What I did:

1. Exported current live theme
2. Installed latest zat (v3.7.1) on ruby (ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.x86_64-darwin19])
3. Ran zat theme preview

[Ingirorhaun]

I had the same assets L:: Mapping has more items than allowed. error and had to remove several files from the assets folder. It would be interesting to know what is the limit exactly