0 Width Of Column Error

Hi

When i create a temp table with a field as blank string as in following example and then try to insert a blank string int it following error is coing.
compatibility level of database is 70

following is the example

Select CtpId = convert(int, a.CtpId), a.OrgId, a.Sname, a.Intls, a.Prfx, a.CallName, a.Sex, a.RspblEmp,
City = convert(char(40), ''), OrgDescr = convert(char(46), ''),
a.ActvtyStatus, a.Sales, a.SaleCntct, a.ContractCntct, a.ContractSigner,
a.CRW, a.WkndCntct, a.UseOrgAddr, CtpTimeStamp = convert(int, a.TimeStamp), FrequentFlyer = convert(bit,0) ,
a.PrevCmpl, b.St, a.DtIns
into #Ctp
from tbCtp a, tbAddr b
where 0 = 1




Select a.CtpId, a.OrgId, a.Sname, a.Intls, a.Prfx, a.CallName, a.Sex, a.RspblEmp,
City = '', OrgDescr = '',
a.ActvtyStatus, a.Sales, a.SaleCntct, a.ContractCntct, a.ContractSigner,
a.CRW, a.WkndCntct, a.UseOrgAddr, CtpTimeStamp = convert(int, a.TimeStamp),FrequentFlyer = 0, a.PrevCmpl,
St = "", a.DtIns
into #CTP
from tbctp a
where a.Sname like 'as%'
and CallName = '%'



ERROR MESSAGE:: Server: Msg 2731, Level 16, State 1, Line 1
"The width of column 'City' is 0. This width is not valid."

Please tell why this error is coming.

Thanks in advance

Rajesh