How can I remove just geometry instances added to primitives in Cesium - cesiumjs

Question

I saw some similar questions like how to remove all primitives and so, but none of the answers help me. I am loading several CZML files on my cesium, and at the same time I need to add some geometry instances, like the code that I provided here to my cesium file, using data from my CZML.
There are two situation in my model, in one of them I want to delete all of my primitives, data sources and entities, for which I used following reset() method. When I tried to remove primitives and entities, I've got DeveloperError: This object was destroyed, i.e., destroy() was called.Error and when I just delete primitive, it said some of entities already exist on the collection, which means it cannot delete all of entities.
In the second case, I just want to delete those geometry instances that I created but I want to keep other entities and data sources. If I delete all the primitives, I will lose some entities that I need.
I have a method when I am loading CZML for creating geometry instances as follows:
function createMap(West,East,South,North,hNumber,VNumber){
var baseSouth=South;
var vdivid=(North-South)/VNumber;
var hdivid=(East-West)/hNumber;
for (var i=0;i<hNumber;i++){
for(var j=0;j<vNumber;j++){
var rectangleInstance = new Cesium.GeometryInstance({
geometry : new Cesium.RectangleGeometry({
rectangle : Cesium.Rectangle.fromDegrees((West+j*vdivid), baseSouth,(West+(j+1)*vdivid) , baseSouth+hdivid)
}),
id : 'rectangle'+i+'.'+j,
attributes : {
color : new Cesium.ColorGeometryInstanceAttribute.fromColor(getRandomColor(0.2))
}
});
scene.primitives.add(new Cesium.GroundPrimitive({
geometryInstance : rectangleInstance
}));
baseSouth=baseSouth+hdivid;
}
};
My reset method is as follows,
function reset(){
clock.multiplier = 1.0;
var primitives = scene.primitives.removeAll();
viewer.dataSources.removeAll();
viewer.entities.removeAll();
};
getRandomColor is a function for generating some specific Cesium colors randomly. I define this method because I want to generate some specific random colors (for example just GREEN, YELLOW, BLUE and RED)

Answer 1

Thanks for posting the reset function. I believe the problem here is that your call to scene.primitives.removeAll() is removing primitives that belong to a dataSource. But in this case, I think it's safe to simply re-order the removals.
Give this a try:
function reset() {
clock.multiplier = 1.0;
// First, remove all dataSources. Removing a dataSource will
// automatically remove its associated entities & primitives.
viewer.dataSources.removeAll();
// Next, remove any remaining entities that weren't part of a dataSource.
viewer.entities.removeAll();
// Finally, it is safe to remove any remaining primitives, as we can
// now be certain they did not belong to any dataSource or entity.
scene.primitives.removeAll();
};