Difficulties in deleting project

When I tried to delete Project it showed, "Cannot delete project 'xx' since it is referenced by one or more entities".

So tried to delete all the entities using the custom service below: Now getting this error while executing the service, "Error executing service trialdeletingentities. Message :: Cannot Delete This Entity - It Is Referenced By 3 Other Entities - See Script Error Log for more details."

Now what are the other ways to delete the project.?

var params = {
infoTableName : "InfoTable",
dataShapeName : "EntityReference"
};
var result = Resources["InfoTableFunctions"].CreateInfoTableFromDataShape(params);

result= Projects["XXXXX"].GetEntities();
for( var i=0;i<result.length;i++)
{
if(result[i].type=='Thing')
{
Resources["EntityServices"].DeleteThing({
name: result[i].name /* THINGNAME */
});
}
else if (result[i].type=='Thing Shape')
{
Resources["EntityServices"].DeleteThingShape({
name: result[i].name
});
}
else if (result[i].type=='Thing Template')
{
Resources["EntityServices"].DeleteThingTemplate({
name: result[i].name
});
}
else if (result[i].type=='Media')
{
Resources["EntityServices"].DeleteMediaEntity({
name: result[i].name
});
}
}