No free slots?

[Zeno McDohl]

I got this error while playing:

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Engine Error
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CBaseEntityList::AddNonNetworkableEntity: no free slots!
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OK   
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Does anyone know what it means and how to stop it from happening again?

 

[DEATH eVADER]

Whn did you get the message and how?

 

[Zeno McDohl]

I was shooting some barrels and set off a chain reaction of some others. A bunch of them blew up.