Parabolic and Bollinger

Required:
Buy: PSAR above BBT
Sell: PSAR below BBB

This is not working…
CROSSOVER(CLOSE, PSAR(CLOSE, 0.02, 0.2)) > BBT(CLOSE, 20, 2, EXPONENTIAL)
CROSSOVER(PSAR(CLOSE, 0.02, 0.2), CLOSE) < BBB(CLOSE, 20, 2, EXPONENTIAL)

can u help with correct codes for the above requirement…