Conversion failed when converting the nvarchar value '03/04/2013' to data type int

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C#

SQL

Query:

ALTER procedure get_validupto(@admin_id int)
as begin
DECLARE @NAME NVARCHAR(255)
if(select count(mac_id) from license_master where user_id=@admin_id)>0
begin
set @name=(select validupto from license_master where user_id=@admin_id)
return @name
end
else
set @name='false'
return @name
end

==================================================================
output:
Running [dbo].[get_validupto] ( @admin_id = 2 ).

Conversion failed when converting the nvarchar value '03/04/2013' to data type int.
The thread '01hw191161\c672c752-75c2-44 [53]' (0xfd4) has exited with code 0 (0x0).
No rows affected.
(0 row(s) returned)
@RETURN_VALUE =
Finished running [dbo].[get_validupto].
=================================================================


returned value is '04/03/2013'in varchar format... thn y i m getting this error as
"Conversion failed when converting the nvarchar value '03/04/2013' to data type int."