Output error when server runs out of memory during migration

[Starker3]

As mentioned in #37 we had a customer who's migration kept failing at a certain point.
They then increased the available memory from 12gb to 24gb and the migration was able to finish.

During this process they said that there were no errors in the logs our output from the migration plugin that indicated what the error was, so they were forced to try different things until something worked (Such as increasing available memory)