/etc/init.d/clamd restart

LibClamAV Warning: Detected duplicate databases /var/lib/clamav/bytecode.cvd and /var/lib/clamav/bytecode.cld, please manually remove one of them
LibClamAV Warning: Detected duplicate databases /var/lib/clamav/main.cvd and /var/lib/clamav/main.cld, please manually remove one of them

rm -f /var/lib/clamav/bytecode.cvd
rm -f /var/lib/clamav/bytecode.cld
rm -f /var/lib/clamav/main.cvd
rm -f /var/lib/clamav/main.cld

/etc/init.d/clamd restart