Like FKI said Hebrons gave you is an example of what you shouldn't do. Try FKI's method. It should work fine.
In response to Dayvon64
Best response
As the error indicates in the line that reads, "Health (/obj/HudHealth/Health): New(null)", you aren't passing a valid argument, which would be a client I'm guessing. That would be redundant though since you are already adding the objects to the client's screen.

This issue is the result of copying someone else's not-so-good example instead of adapt and integrating what you have learned into your system.
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