Hello socgrrrl,
It sounds like you're trying to share media from your MacBook to your iPhone using Home Sharing and running into some issues. We'll be glad to help out.
We have a great article that can guide you through ensuring your settings are all set correctly to allow this to happen. Check it out here: Use Home Sharing to share media from a computer to other devices
If you have all of those settings set correctly and you still run into the issue with the app crashing, let's have you go through these steps: If an app unexpectedly quits, stops responding, or won’t open
Feel free to reach back out to the Community if you need further help.
Take care!