Unable to use Group Runners in my project

I have a CI/CD Pipeline on GitLab. When I try to run the pipeline, it get this

In the runners page, I have a group runner that is available for my project.

Can anybody please let me know how to assign this runner to my project. I am not able to find any options for it.

Thanks in advance.

The issue was because the project has no tags and the runner had the condition “to execute only jobs with tags”. Changed it and it is working now.