hi Guys,

recently i have been trying to write a code but when i run it it shows me this:

“UndefVarError: @variable not defined” this is the entire code:

’ ’ ’ Julia

function scan_maker(A)

m = Model(solver=ClpSolver(PrimalTolerance=1e-3, DualTolerance=1e-3, InfeasibleReturn=1, PresolveType=1))

# m = Model(solver=GurobiSolver())

level = size(A, 2)

v = zeros(Int, level)

ub = zeros(Int, level)

lb = zeros(Int, level)

```
@variable(m, x[1:level])
@constraint(m, con, A*x.>=0)
function setc(c)
for i = 1:size(A, 1)
m.linconstr[i].lb = float(c[i])
end
end
function scan()
i = 1
init = 1
while i > 0
if i >= init
@objective(m, Max, x[i])
res = JuMP.solve(m, suppress_warnings=true)
if res==:Optimal || res==:Unbounded
ub[i] = round(Int, getvalue(x[i]))
setobjectivesense(m, :Min)
res = JuMP.solve(m, suppress_warnings=true)
@assert res==:Optimal || res==:Unbounded
lb[i] = round(Int, getvalue(x[i]))
v[i] = lb[i]
init += 1
else
@assert res==:Infeasible
i -= 1
continue
end
elseif v[i] < ub[i]
v[i] += 1
else
setupperbound(x[i], Inf)
setlowerbound(x[i], -Inf)
init -= 1
i -= 1
continue
end
if i >= level
produce(v)
continue
else
setupperbound(x[i], v[i])
setlowerbound(x[i], v[i])
i += 1
end
end
end
return setc, scan
```

end

’ ’ ’

i don’t know if there is a missing Pakage or something.