I’m frustrated

Xpand!2 has no sound Logic Pro X

I'm currently using Xpand!2 for the first time

Logic Pro X 10.0.5
MacBook Pro OS X 10.8.4
M-Audio Oxygen 49 New

I have installed the plugin and loaded it up in a channel but when I play it no sound is created.
My computer recognises a midi signal but no sounds are created. The sound library is appearing also but none of them work :(
Please help!!
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