Triggering animation with layer markers

Hi Everyone,

I need help to refine this expression of triggering animation with layer markers.

I have animation of a text that starts with key 1 to key 2 and then this text transition to another text key 3 to key 4 and then text out key 5 to key 6.

The 2 texts layers are pre composed, and my expression is applied into the Time remapping with these 6 keys.

Basecaly, the expression works fine, just I'm getting expression error for this line 

if (time < T.marker.key(1).time)
linear(time,inPoint.time,key(2).time,key(1).value,key(2).value)
else

Everytime, I move my timeline indecator before my marker.key(1). But the expression keeps working fine.

This is my expression:

T = thisLayer;
if ((T.marker.numKeys > 1 ) && (numKeys > 5)){
dIn = key(4).time - key(3).time;
dTr = key(2).time - key(1).time;
dOut = key(6).time - key(5).time;
eIn = T.marker.key(1).time;
eOut = T.marker.key(2).time;

if (time < T.marker.key(1).time)
linear(time,inPoint.time,key(2).time,key(1).value,key(2).value)
else
value

if (time < T.marker.key(2).time)
linear(time,eIn,eIn+dIn,key(3).value,key(4).value)
else
linear(time,eOut,eOut+dOut,key(5).value,key(6).value);
}else
value;

Thank you for your help