W302 shows Memory Card Not available. File saved in Phone memory

Hi,

My Sony Ericsson W302 shows "Memory Card Not available. File saved in Phone memory"

But all the mp3s and photos, videos are being played well from the card.

the card sill has 315 MB free space.

Whats wrong? I took the card off and inserted it, no success.

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When you get the error, what are you dong? Using the camera? Recording?