Hello,

I wrote a model about Julia which contains 3 constraints. If I test one constraint at a time, each one works. But if I run the whole program, I get the following error message:

Has anyone had this problem before and would know where it could be coming from?

It seems to me that the problem comes from a problem between these two constraints:

```
#contrainte 2
for j in 1:s
if ws2[j+1,4] == 1
@constraint(TB, sum(x[i, j] for i in 1:e) <= 8)
else
@constraint(TB, sum(x[i, j] for i in 1:e) <= 12)
end
end
#contrainte 3
for i in 1:e
if (ws[i+1,3]==1)
j = ws[i+1,4]
@constraint(TB, x[i,j]==1)
end
end
```

Thanks in advance for your help!