Error when i add sheet

hii
    I generated the DICE report this below error occurs can you suggest me any solution for it
(Warning- Attribute SHRF contains invalid ref)
(Warning- Attribute NOTF contains invalid ref)


Thank You

hii
    I generated the DICE report this below error occurs can you suggest me any solution for it
(Warning- Attribute SHRF contains invalid ref)
(Warning- Attribute NOTF contains invalid ref)


Thank You