How to create a Solr core though Ubuntu terminal?

I am installing the Clarity NLP (local machine setup without docker) and I am following the directions provided at https://claritynlp.readthedocs.io/en/latest/setup/local-no-docker.html#setup-solr. When I run the following commands:

conda activate claritynlppython ./configure_solr.py

the python script should create a Solr core named claritynlp_test, but I am getting an error:

error: failed to create new core instance directory: /var/solr/data/claritynlp_test

And in the solr admin dashboard logger I get the following message:

org.apache.solr.common.SolrException: Cannot unload non-existent core [claritynlp_test]

I am not very familiar with the command line, so I'm just following the directions provided in the document. So how can I fix this issue and create the core?