Hi, I am new here and I am getting an error. The code is:

int nbNodes = ...;

int nbSlots = ...;

range Nodes = 1..nbNodes;

range Slots = 1..nbSlots;

//Demands and paths

tuple demand {int source; int destination; int bd; int nd;}

setof(demand) Demands = ...;

tuple tpath{int pathNodes;}

{tpath} P =...;

setof(tpath) PathsDemands=...;

tuple tchannel {int channelSlots;}

setof(tchannel) C = ...;

setof(tchannel) ChannelsDemands=...;

tuple tlink {int linkhttp://1..2;}

setof(tlink) E = ...;

tuple slot {int i;}

{slot} S = ...;

//decision variables

dvar boolean deltape[P][E];

dvar boolean gamacs[C]Slots;

dvar boolean xdDemands;

dvar boolean ypc[P][C];

minimize sum (d in Demands) xd[d]*d.bd;

subject to{

forall(d in Demands)

sum (p in Paths[d])

sum(c in Channels[d])

ypc[p][c] + xd[d] == 1;

forall(e in E, s in Slots) //error

sum (d in Demands)

sum (p in Paths[d])

sum (c in Channels[d])

deltape[p][e]*ypc[p][c]*gamacs[c][s] <= 1;

};

I suspect the error is related with the third degree term, but I don't know how to solve. Can anyone help me?

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