Dealloc a viewcontroller warning

Question

I am getting this warning which is very annoying. Problem occurs when I tried to allocate new viewController from another viewController. Has anybody seen this warning before? What can I do to make it disappear? It important for me to fix it.

2016-09-19 16:55:09.216523 App[5204:1274804] [Common] _BSMachError: port e26f; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
2016-09-19 16:55:09.217554 App[5204:1274804] [Common] _BSMachError: port e26f; (os/kern) invalid name (0xf) "Unable to deallocate send right"

Solution

DispatchQueue.main.async(execute: {
  // put your code to do allocate new viewController from 
  // another viewController here to ensure running in main thread
})