Fee Estimation failed . fallback fee is disabled. Wait a few blocks or enable -fallbackfee
i just let it do its thing while watching a movie and now it's cleared.... guess he had to catch up some blocks for good 
It indeed required to catch-up because the fee estimation algorithm will have to check your mempool and blockchain for the latest transactions' fee rate.Next time if you need to send a transaction right away: you can manually set the fee rate by clicking "Choose..." next to the transaction fee.
It will let you set a custom transaction fee at BTC/kvB; e.g.: 0.00001000 for 1sat/vB.
thanks for all tips!