Trying to make a single checkbox controller to control opacity of 2 layers (on/off)

Trying below expression on layers for opacity control. but its not working
my checkbox is on adjustment layer

Layer 1 - if (thisComp.layer("Adjustment Layer 2").effect("Checkbox Control")("Checkbox") ==0) 0 else 100;

Layer 2 - if (thisComp.layer("Adjustment Layer 2").effect("Checkbox Control")("Checkbox") ==0) 100 else 0;