Usually when my shutter won't operate, I get an ERR message. I have been able to fix it by turning the camera off and back on. If that doesn't work, I have occasionally had to remove and reinstall the battery.
The D-90 users manual says that the ERR message indicates a camera malfunction and can be cleared by releasing the shutter. But, I found the shutter won't release unless you turn the camera off.
The manual also says if this condition occurs frequently or persists, you should contact an Nikon authorized repair center. I suggest before you do that, that you contact Nikon tech support at www.nikon.com to see what they might suggest.
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