There is no site configured for your solr extension.
Please check the following:
- Your page has a domain record.
- Your site has a page, marked as root page.
- Your page has included the solr typoscript configuration.
- You've initialized the solr connections in the backend with the menu item "Initialize solr connections"
- Afterwards please check if the reports module is showing any errors.
When all of these steps are done check this module again.