Ok got the solution from pancakeswap TG group. see below"
"With regards to the AMPL-BNB Syrup pool:
AMPL is a rebasing token and as such, negative rebases had lead to the rewards being drained faster than was previously announced.
We have called the StopReward function a few hours ago and have reached out to the Ampleforth team to see if they are willing to cover the remaining required rewards.
Until we have a reply from them you can either:
Wait.
Forfeit your outstanding rewards by calling the EmergencyWithdraw function via direct interaction with the contract.
Just to clarify, I said “unstake my AMPL” but I meant I was trying to unstake my CAKE from the AMPL-CAKE pool in the Pancakeswap Syrup Pool. So obviously this is affecting all AMPL pools.