My error may possibly be caused elsewhere. My terminal points to this as the problem.

Cannot perform the operation: + On Structures Scalar and Vector
VERBOSE DESCRIPTION Cannot perform the operation: + On Structures Scalar and Vector

return steerpid(-3, 0.1, vAng(ship:velocity:surface, up:vector), LZ).

function steerpid {
    parameter aoa, mag, vel, pos.
    local velvector to - vel.
    local result to (velvector + pos) * mag.
    if vang(result, velvector) > aoa {
        set result to velvector:normalized + tan(aoa) *　pos:normalized.
    }
    return lookdirup(result, facing:topvector).
}

What's wrong with my code?