<detail>
<band height="417">
<image onErrorType="Blank">
<reportElement x="84" y="10" width="380" height="380" uuid="876b42e6-3b20-4746-85b4-04ee04883e18"/>
<imageExpression><![CDATA[$V{emailidVarb}]]></imageExpression>
</image>
</band>
Use onErrorType=Blank inside Image tag. It will not show any image if image is not available instead of showing Byte not found.