Currently in the UE code that is on these lines you have this:
$BurstSize = undefined;
$BurstTime = undefined;
$WaitTime = undefined;
You should update these lines so that they are like this instead:
$BurstSize = 200;
$BurstTime = 1;
$WaitTime = 1;
This should stop the error that you are getting when you get to this page. I have logged this issue as a bug so that it can be fixed in a future update.