trying to solve my Thesis Model there has been message about infeasible solution. ''Warning: After zero iterations CPLEX 12.8 concluded that an integer solution to MeanCostPlan4 does not exist.''

the model is about my thesis, so i would appreciate some help. i attach a zipped file(Fdata1 is the data file i use) & the excell for the extra data for Section4.

More details about the Model:

- The problem is in section4. when i run the Mp of section3 i find a solution, but with the data of Section4, infeasibility

- We use a network of 10Nodes. starting node=i & end node=j. We want to have 2 hubs one from S=Pre-istalled nodes(1-7) & one from T=install new Hub(8-10)

- we want the whole flow to pass throught the Hubs S&T so i create the variable Z(i,j,s,t)

- In section1 is the main model, in section2 The installation cost, in section3 constraints about the capacity of the nodes and in Section4 Constraints about thn minimum flow from each node i to eacg hub S&T