Getting error when using failback: 'blocking'

[Keisuke69xx]

When I use fallback: 'blocking', deploy failed due to an error. This error seems to be in @netlify/plugin-nextjs.
If I just set fallback parameter to 'false', there is no issue and deploy is successful.
This value blocking has been supported from Next.js 10.

Logs on the deploy log were here.

10:30:59 PM: ────────────────────────────────────────────────────────────────
10:30:59 PM:   Plugin "@netlify/plugin-nextjs" internal error                
10:30:59 PM: ────────────────────────────────────────────────────────────────
10:30:59 PM: ​
10:30:59 PM:   Error message
10:30:59 PM:   Error: 'netlify-automatic-functions/next_posts_id/next_posts_id.js' already exists
10:30:59 PM: ​
10:30:59 PM:   Plugin details
10:30:59 PM:   Package:        @netlify/plugin-nextjs
10:30:59 PM:   Version:        1.0.2
10:30:59 PM:   Repository:     git+https://github.com/netlify/netlify-plugin-nextjs.git
10:30:59 PM:   npm link:       https://www.npmjs.com/package/@netlify/plugin-nextjs
10:30:59 PM:   Report issues:  https://github.com/netlify/netlify-plugin-nextjs/issues
10:30:59 PM: ​
10:30:59 PM:   Error location
10:30:59 PM:   In "onBuild" event in "@netlify/plugin-nextjs" from Netlify app
10:30:59 PM:       at mayCopyFile (/opt/buildhome/.netlify-build-plugins/node_modules/fs-extra/lib/copy-sync/copy-sync.js:62:11)
10:30:59 PM:       at onFile (/opt/buildhome/.netlify-build-plugins/node_modules/fs-extra/lib/copy-sync/copy-sync.js:54:10)
10:30:59 PM:       at getStats (/opt/buildhome/.netlify-build-plugins/node_modules/fs-extra/lib/copy-sync/copy-sync.js:48:44)
10:30:59 PM:       at startCopy (/opt/buildhome/.netlify-build-plugins/node_modules/fs-extra/lib/copy-sync/copy-sync.js:38:10)
10:30:59 PM:       at handleFilterAndCopy (/opt/buildhome/.netlify-build-plugins/node_modules/fs-extra/lib/copy-sync/copy-sync.js:33:10)
10:30:59 PM:       at copySync (/opt/buildhome/.netlify-build-plugins/node_modules/fs-extra/lib/copy-sync/copy-sync.js:26:10)
10:30:59 PM:       at setupNetlifyFunctionForPage (/opt/buildhome/.netlify-build-plugins/node_modules/next-on-netlify/lib/helpers/setupNetlifyFunctionForPage.js:21:3)
10:30:59 PM:       at /opt/buildhome/.netlify-build-plugins/node_modules/next-on-netlify/lib/pages/getStaticPropsWithFallback/setup.js:20:5
10:30:59 PM:       at Array.forEach (<anonymous>)
10:30:59 PM:       at setup (/opt/buildhome/.netlify-build-plugins/node_modules/next-on-netlify/lib/pages/getStaticPropsWithFallback/setup.js:16:9)

[lindsaylevine]

hey @Keisuke69 thanks so much for opening this! i know why this is happening, unfortunately, as the current version of next-on-netlify doesn't expect that string value for fallback pages. i'm going to close this here and open a copy in github.com/netlify/next-on-netlify since that's where the issue exists. i'll tag you there!