"Invalid relationship value. Must be either a document ID or a document, array given.

In my app i am trying to update the documents in my databse from a form in my app, and i am getting this error Error updating event users: AppwriteException: Invalid relationship value. Must be either a document ID or a document, array given. at async updateEventUsers (lib/actions/events.actions.ts:138:29) 136 |
137 | // Update the event document

138 | const updatedEvent = await databases.updateDocument( | ^ 139 | appwriteConfig.databaseId, 140 | appwriteConfig.eventCollectionId, 141 | eventId, { code: 400, type: 'relationship_value_invalid', response: '{"message":"Invalid relationship value. Must be either a document ID or a document, array given.","code":400,"type":"relationship_value_invalid","version":"1.6.2"}' } ⨯ Error: Failed to update event users. Please try again. at updateEventUsers (lib/actions/events.actions.ts:151:14) 149 | } catch (error) { 150 | console.error("Error updating event users:", error); 151 | throw new Error("Failed to update event users. Please try again."); | ^ 152 | } 153 | } 154 | { digest: '2401185207' }

I am tyring to work out if updating relationship attbuties is not something i can do?