Your will get this error during cpanel account transfer time or with cpanel package account script. To fix this issue do the following bash script
#!/bin/bash
cd /var/cpanel/bandwidth
for i in `/bin/ls ./*.rrd`
do
/usr/local/cpanel/3rdparty/bin/rrdtool dump $i > $i.xml
if [ -s "$i.xml" ]
then
echo "$i.xml have valid data."
/usr/local/cpanel/3rdparty/bin/rrdtool restore -f $i.xml $i
else
echo "$i.xml is empty. So not possible to restore"
rm -vf $i $i.xml
fi
done
