Binder starter URL not workin after jupyter-starters upgrade

[datakurre]

Binder URL to start with a starter

https://mybinder.org/v2/gh/robots-from-jupyter/robotkernel/master?urlpath=lab/tree/starter/robotkernel-quickstart

stopped working after upgrading to starters 1.1.0 with error

Cannot open
Could not find path: starter/robotkernel-quickstart

(404 for a url like https://hub.gke2.mybinder.org/user/robots-from-jupyter-robotkernel-ktqhjdyi/api/contents/starter/robotkernel-quickstart?content=0&1649348907830)

According to docs, this is the right format

https://mybinder.org/v2/gh/robots-from-jupyter/robotkernel/master?urlpath=lab%3Fstarter%2Frobotkernel-quickstart%2F

but neither does that work.

Starters are visible and work well from launcher.

Related files:

• https://github.com/robots-from-jupyter/robotkernel/blob/master/binder/postBuild
• https://github.com/robots-from-jupyter/robotkernel/blob/master/binder/environment.yml

[datakurre]

@bollwyvl Would you see something obvious missing, why jupyter-starters URL stopped working?

Kernel extension should be there:

 $ jupyter serverextension list
config dir: /srv/conda/envs/notebook/etc/jupyter
    jupyter_starters  enabled 
    - Validating...
      jupyter_starters 1.1.0 OK
    jupyter_resource_usage  enabled 
    - Validating...
      jupyter_resource_usage 0.6.1 OK
    jupyterlab  enabled 
    - Validating...
      jupyterlab 3.2.9 OK
    nteract_on_jupyter  enabled 
    - Validating...
      nteract_on_jupyter 2.1.3 OK
    jupyter_offlinenotebook  enabled 
    - Validating...
      jupyter_offlinenotebook  OK