To create this expert, you have to create 2 custom indicators first
{Countbacklines buy}
Days:=10;
BV:=If(L>LLV(L,Days),PREV,
If(Ref(H,-2)>Ref(H,-1) AND Ref(H,-1)>H,Ref(H,-2),
If(Ref(H,-3)>HHV(H,3) AND Alert(Ref(H,-1)>H,2),Ref(H,-3),
If(Ref(H,-4)>HHV(H,4) AND Alert(Ref(H,-1)>H,3),Ref(H,-4),
If(Ref(H,-5)>HHV(H,5) AND Alert(Ref(H,-1)>H,4),Ref(H,-5),
PREV)))));
BV;

{Countbacklines Sell}
Days:=10;
SV:=If(H<HHV(H,Days),PREV,
If(Ref(L,-2)<Ref(L,-1) AND Ref(L,-1)<L,Ref(L,-2),
If(Ref(L,-3)<LLV(L,3) AND Alert(Ref(L,-1)<L,2),Ref(L,-3),
If(Ref(L,-4)<LLV(L,4) AND Alert(Ref(L,-1)<L,3),Ref(L,-4),
If(Ref(L,-5)<LLV(L,5) AND Alert(Ref(L,-1)<L,4),Ref(L,-5),
PREV)))));
SV;

Now for the expert
under the highlight tab

Long

Buy:=Cross(C, Fml( "Countbacklines buy"));
Sell:=Cross(Fml( "Countbacklines Sell"),C);
D:=If(BarsSince(Buy)<BarsSince(Sell),-1, If(BarsSince(Buy)>BarsSince(Sell),1,0));
D=-1

Short

Buy:=Cross(C, Fml( "Countbacklines buy"));
Sell:=Cross(Fml( "Countbacklines Sell"),C);
D:=If(BarsSince(Buy)<BarsSince(Sell),-1, If(BarsSince(Buy)>BarsSince(Sell),1,0));
D=1

now under the symbol tab

EL

Buy:=Cross(C, Fml( "Countbacklines buy"));
Sell:=Cross(Fml( "Countbacklines Sell"),C);
D:=If(BarsSince(Buy)<BarsSince(Sell),-1, If(BarsSince(Buy)>BarsSince(Sell),1,0));
D=-1 AND Ref(D,-1)>-1

ES

Buy:=Cross(C, Fml( "Countbacklines buy"));
Sell:=Cross(Fml( "Countbacklines Sell"),C);
D:=If(BarsSince(Buy)<BarsSince(Sell),-1, If(BarsSince(Buy)>BarsSince(Sell),1,0));
D=1 AND Ref(D,-1)<1

When I try the explorer or System tester with the above formulae I receive the message: "Internal compiler error. Insufficient memory for binary." What does it mean? Is there a way around this error message? Thanks

Did you ever figure out what that error message was?....

No.