In order to process the transaction, the tribute information needs to be linked to the appropriate record in The Raiser's Edge. 

Follow the steps here to link Tributes

Note: in the rare chance the binoculars icon to search for the tribute is grayed out, the transaction will need to be entered manually into The Raiser's Edge. At times, this may occur if you recently enabled the Tribute module in Raiser's Edge, but did not yet create any Tribute Types. The new Raiser's Edge module addition will auto-enable the feature on all NetCommunity donation forms, we suggest to add tribute types in Raiser's Edge or disable tributes in NetCommunity to resolve the issue for future gifts.