Need some help with a cryptic (to me) error. I'm on version 0.52, and getting a build error. There's no output in the build folder. The error is:

[Error: ENOENT: no such file or directory, open '/path/to/browser-extension/1a6659328bbc0614-95a799e0a03e5c5a.js'] {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/path/to/browser-extension/1a6659328bbc0614-95a799e0a03e5c5a.js'
}

I'm not sure what this file reference is, and why its not being picked up.

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