[Help-glpk] out of domain

[Daniele Micarelli]

Hi,
i have this bond:  subject to DLINE{i in SLA}: sum{t in K} x[i,t]=1 ; /* vincolo di Deadline sulle SLA */  in the file.mod

where the set K is defined as: set K := 0..Deadline ; in the file.dat

Deadline is a parameter defined in the file.dat :
param Deadline :=

A17  32
A18  40
A25  44 ;

When A17,A18 and A25 are activities and 32,40 and 44 are the values ​​of the corresponding deadline

But when i try i get this error: x[A17, "0..Deadline"] out of domain
what it means?
how can i fix it?

thank you very much