Create a working TimeTable

Hello everyone, 

for my model i need multpile periods, where in each period i can go through the procedure of order release. 

In order to do that i followed the “Aimms Professional Tutorial” and created a Horizon and a Calendar. But when i want to run the procedure “LinkHorizonToCalender” i get the following error message:

The current period value 'period-01' is not an element of horizon "ModelPeriods".

I dont know why or how to fix this problem. 

Can anyone help me with that?

Kind regards 

Alex