scaffold fails with errno 21

[arkD]

Describe the bug
scaffold fails errno 21

To Reproduce
Steps to reproduce the behavior:

1. follow guide on graphql.yoga
2. using prisma with postgres
3. setup with no errors and dev runs fine
4. run npm run scaffold
5. any name, yes to CRUD, makes changes to model (I tried editing and not editing the model)
6. throws error after model change (or no change)

Expected behavior
expect it not to throw error

Versions (please complete the following information):

• OS: Ubuntu 18.04
• yoga CLI: [e.g. `yoga/0.0.17 (darwin-x64)
• node-v10.16.0`
• npm 6.10.2

Additional context
log: https://pastebin.com/NCj8xBDb