Bus has no name and therefore defines no signals orcad

Hi

I ve got this error:
Bus has no name and therefore defines no signals

when I ve tried to draw a schematic in orcad

any help?

10x

IN orcad a bus mast have a name like : bus[n1-n2], where n1 and n2 define the number of signals in the bus that must have a name :busn1, busn1+1.......busn2