I get the following error when I try to submit a transaction on the hyperleger playground

Question

Error: Object with ID '7660' in collection with ID 'Asset:org.acme.biznet.Handset' does not exist

Answer 1

not enough information as to how you encounter this.

1. Is this transaction trying to update the ID field ?

2. Are you trying to update an asset (in the same transaction) that is not yet committed to the ledger ? 

3. Have you got ACLs applied (so the participant in question cannot 'see' the asset in question due to restrictions).

Suggest to post the model and the full transaction code / sample data.