# The error `load.unknown-entry`

**environment**: something the run needs is missing or different where it runs (a package, a file, a device, the network): the error names what to install, fetch or attach.

Where MIME gives it, with what its message says happened and what its action says to do (`{…}` is filled in from the experiment):

- in `mime/saved/_resolve.py`:
  - what happened: `{…} names {…} {…} {…}, which no installed package registers`
  - what to do: `install the package that registers {…} {…} ('pip install <package>'): its namespace is {…}, and the lock names no distribution for it` or `install the package it came from: pip install '{…}=={…}'`

Reading an error and reaching its full traceback: [reading an error](../reading_errors.md). Every code: [the index](index.md).