Looks like you have a typo? I presume you have a directory called platform-install-packages under the directory where you created docker-compose.yml and that the platform-install-packages contains https://github.com/kaltura/platform-install-packages/blob/Mercury-13.16.0/Dockerfile?
If not, obviously this needs to be corrected. If you DO and you’ve fixed your typo, what does the docker-compose command output?