Not enough storage.

Hello wi 715 and welcome to Apple Support Communities. It appears you are having some difficulty managing space on your Apple Watch. Is this happening when you try to update?

If you don’t have enough space to update your Apple Watch - Apple Support

Start (even if this is not related to an update) with the tips in that article as they're generally good strategies for managing storage. If these do not resolve the issue, consider unpairing the Watch from the paired iPhone and the re-pair the two devices.

Unpair and erase your Apple Watch - Apple Support

Cheers.

Hi wi715.

Brilliant! Glad to hear you got it sorted. Have a super groovy rest of your day.

Cheers.