My apple watch wont open apps

That is what I would've tried first. How are other apps opening?

Have you tried turning the watch off and on again. The power button is under the digital crown hold it down until you see the option to turn off, swipe to turn off

Hi

The following steps may help:

If you have not yet done so, update your iPhone and Apple Watch to the latest software, starting with your iPhone:

• Update the iOS software on your iPhone, iPad, or iPod touch - Apple Support
• Update the software on your Apple Watch - Apple Support

Install any available updates for your apps:

• On your iPhone, in the App Store app, go to: Updates (tab) > install all available updates.

Remove and reinstall the app on your watch:

• On your iPhone, in the Watch app, go to: My Watch > tap on the app name in the list of apps > turn off Show App on Apple Watch > wait until the app has been removed > turn the setting back on again.

Close the app on your iPhone and restart both your iPhone and your watch:

• To close the app on your iPhone: double-click the Home button, then swipe up on the app preview.
• Turn both devices off together, then restart your iPhone first:
  • Restart your iPhone, iPad, or iPod touch - Apple Support
  • Restart your Apple Watch - Apple Support

Unpair and re-pair your watch:

• The Watch app on your iPhone takes a backup of your watch automatically when unpairing via the app. Choose to Restore from Backup during set up. Most data and settings will be restored, with some exceptions (eg Apple Pay cards, passcode).
• Unpair your Apple Watch and iPhone - Apple Support
• Set up your Apple Watch - Apple Support

If the issue then persists, I suggest that you contact the app developer for assistance:

On your iPhone, in the App Store app: find and view the app > tap on Reviews > tap on App Support.

More information:

Get help finding, installing, and using apps on your Apple Watch - Apple Support

I would recommend restarting your watch and seeing if that makes a difference. You can get instructions on how to do it here