FileNotFoundError: [Errno 2] No such file or directory:

Building a snap of a nodejs command line app.
Using snapcraft, version 2.43.1+18.4 on Ubuntu 18.10

I run snapcraft from the project root, which contains snap/snapcraft.yaml
There is the bin/pocket-cli file which is the file I want to be executed.

The snapcraft.yaml has:

```
parts:
  pocket-cli:
    plugin: nodejs
    source: .
    node-engine: 11.4.0

apps:
  pocket-cli:
    command: bin/pocket-cli
```

When it gets to run ```npm --cache-min=Infinity install --global``` at one point fails like this:

The version has been set to 'v0.4.3+git8.d0ba52c'
Sorry, an error occurred in Snapcraft:
Traceback (most recent call last):
  File "/usr/bin/snapcraft", line 11, in <module>
    load_entry_point('snapcraft==2.43.1+18.4', 'console_scripts', 'snapcraft')()
  File "/usr/lib/python3/dist-packages/click/core.py", line 759, in __call__
    return self.main(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 714, in main
    rv = self.invoke(ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 1109, in invoke
    return Command.invoke(self, ctx)
  File "/usr/lib/python3/dist-packages/click/core.py", line 951, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/lib/python3/dist-packages/click/core.py", line 552, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/_runner.py", line 93, in run
    ctx.forward(lifecyclecli.commands["snap"])
  File "/usr/lib/python3/dist-packages/click/core.py", line 570, in forward
    return self.invoke(cmd, **kwargs)
  File "/usr/lib/python3/dist-packages/click/core.py", line 552, in invoke
    return callback(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 136, in snap
    project = _execute(steps.PRIME, parts=[], **kwargs)
  File "/usr/lib/python3/dist-packages/snapcraft/cli/lifecycle.py", line 35, in _execute
    lifecycle.execute(step, project_config, parts)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 90, in execute
    executor.run(step, part_names)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 196, in run
    self._create_meta(step, processed_part_names)
  File "/usr/lib/python3/dist-packages/snapcraft/internal/lifecycle/_runner.py", line 359, in _create_meta
    self.config.validator.schema,
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 109, in create_snap_packaging
    packaging.write_snap_yaml()
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 312, in write_snap_yaml
    snap_yaml = self._compose_snap_yaml()
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 468, in _compose_snap_yaml
    snap_yaml["apps"] = self._wrap_apps(self._config_data["apps"])
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 567, in _wrap_apps
    self._wrap_app(app, apps[app])
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 575, in _wrap_app
    app[k] = self._wrap_exe(app[k], "{}-{}".format(k, name))
  File "/usr/lib/python3/dist-packages/snapcraft/internal/meta/_snap_packaging.py", line 546, in _wrap_exe
    with open(exepath, "rb") as exefile:
FileNotFoundError: [Errno 2] No such file or directory: '/home/ildella/projects/personal/pocket-cli/prime/bin/pocket-cli'
We would appreciate it if you created a bug report at
https://launchpad.net/snapcraft/+filebug with the above text included.