arrayfire-rust: Possible bug in `sum_by_key`

I have used arrayfire::sum_by_key in its most basic test case and it still produces this error.

While there exists no example in the rust docs, from checking documentation at: http://arrayfire.org/docs/group__reduce__func__sum__by__key.htm

I cannot see a way to simplify my usage.

Attached test project: af_sum_by_key_test.zip

Code:

use arrayfire::{af_print,print_gen,Array,Dim4,sum_by_key};

fn main() {
    println!("Hello, world!");

    let keys = Array::<u32>::new(&[0,0,0,1,1,1],Dim4::new(&[6,1,1,1]));
    af_print!("keys:",keys);
    let vals = Array::<u32>::new(&[1,2,3,4,5,6],Dim4::new(&[6,1,1,1]));
    af_print!("vals:",vals);
    
    let sum_by_key = sum_by_key(&keys,&vals,0i32);
    af_print!("sum_by_key keys:",sum_by_key.0);
    af_print!("sum_by_key vals:",sum_by_key.1);
}

Full error:

thread 'main' panicked at 'Error message: Error either in ArrayFire or in a project upstream
Last error: OpenCL Error (-11): Build Program Failure when calling clBuildProgram', C:\Users\jonat\.cargo\registry\src\github.com-1ecc6299db9ec823\arrayfire-3.7.0\src\error.rs:40:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.
error: process didn't exit successfully: `target\debug\af_sum_by_key_test.exe` (exit code: 101)

Using windows. ArrayFire 3.7.1 installed. System environment variable AF_PATH_v3 set as C:\Program Files\ArrayFire\v3. System environment variable Path contains C:\Program Files\ArrayFire\v3\lib.

I apologise if this is not an error and it is my own mistake.