Hello everyone, when I execute this code in minizinc, it not working, please support me to correct it: $\%$ Parameters

int: n$\_$employee; $\%$ number of technicians

int: n$\_$turbine; $\%$ number of wind turbines

int: n$\_$tasks; $\%$ number of tasks

int: n$\_$week; $\%$ number of weeks

int: n$\_$day; $\%$ number of days per week

int: n$\_$period $=$ n$\_$day $*3$; $\%$ number of periods per day

$\%$ Productivity of each wind turbine during each period

array$[1..$n$\_$turbine, $1..$n$\_$period$]$ of float: productivity;

$\%$ Wind turbine assigned to each task

array$[1..$n$\_$tasks$]$ of int: on$\_$turbine;

$\%$ Duration of each task in periods

array$[1..$n$\_$tasks$]$ of int: length;

$\%$ Skills of technicians

int: n$\_$skills; $\%$ Number of available skills

array$[1..$n$\_$employee, $1..$n$\_$skills$]$ of int: skills;

$\%$ Skills required to perform each task

array$[1..$n$\_$tasks$]$ of int: skill$\_$req;

$\%$ Decision Variables

array$[1..$n$\_$tasks, $1..$n$\_$period$]$ of var $0.\mathrm{.}1$: exec; $\%$ Task execution

array$[1..$n$\_$tasks, $1..$n$\_$period$]$ of var $0.\mathrm{.}1$: start; $\%$ Task start

array$[1..$n$\_$tasks, $1..$n$\_$period$]$ of var $0.\mathrm{.}1$: end; $\%$ Task end

$\%$ Constraints

$\%$ Each task must start exactly once

constraint

forall$($i in $1..$n$\_$tasks$)($

sum$($p in $1..$n$\_$period$)($start$[$i$,$ p$])=1$

$)$;

$\%$ Each task must finish exactly once

constraint

forall$($i in $1..$n$\_$tasks$)($

sum$($p in $1..$n$\_$period$)($end$[$i$,$ p$])=1$

$)$;

$\%$ Each task must last for its specified duration across consecutive periods

constraint

forall$($i in $1..$n$\_$tasks$)($

sum$($p in $1..$n$\_$period$)($exec$[$i$,$ p$])=$ length$[$i$]$

$)$;

$\%$ No overlapping tasks on the same turbine during a single period

constraint

forall$($t in $1..$n$\_$turbine, p in $1..$n$\_$period$)($

sum$($i in $1..$n$\_$tasks where on$\_$turbine$[$i$]=$ t$)($exec$[$i$,$ p$])<=1$

$)$;

$+($exec$[$i$,$ p$-1]/\backslash ($end$[$i$,$ p$-1]=0))$

$)$;

$\%$ Initialization of the first period

constraint

forall$($i in $1..$n$\_$tasks$)($

exec$[$i$,1]=$ start$[$i$,1]$

$)$;

$\%$ Objective function: Maximize the total energy production

var float: total$\_$energy $=$ sum$($i in $1..$n$\_$tasks, p in $1..$n$\_$period$)($

exec$[$i$,$ p$]*$ productivity$[$on$\_$turbine$[$i$],$ p$]$

$)$;

solve maximize total$\_$energy;

here is the data value: $\%$This first case is a very simple test on $2$ days and $2$ wind turbines

$\%$You can solve it by hand to be sure of your result and modify the data for testing purposes

n$\_$employee $=1$;

n$\_$turbine $=2$;

n$\_$tasks $=3$;

n$\_$week $=1$;

n$\_$day $=2$;

n$\_$period $=$ n$\_$day$*3$; $\%3$ periods per day

$\%$productivity of an wind turbine at each period

productivity $=$ array$2$d$(1..$n$\_$turbine,$1..$n$\_$period,$[10,8,10,8,9,9,$

$10,5,6,7,9,9])$;

$\%$duration and location of each task

on$\_$turbine $=$ array$1$d$(1..$n$\_$tasks,$[1,1,2])$;

length $=$ array$1$d$(1..$n$\_$tasks,$[1,1,2])$;