That error meas that the MySQL server has no free connections. Its like a plane/bus/car it only fits so much. Once its full its full and it can't take anymore until people get off.
This is a SERVER issue, not related specificly to your install of vBulletin unless you have a completely dedicated server.
This is a SERVER issue, not related specificly to your install of vBulletin unless you have a completely dedicated server.
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