Restricted datatype attribute violation

Hay
I have report connected to stored procedure(with parameters) (sqlserver2000)
, and thes stored procedure have to option first one return 4 fileds and
the second return 5 fileds .
When i run the report from crystal report its work fine with the two options
becuase i but the fifth field in formula filed in report.
But when i but these report inside my visual basic project when i first
time run the report its give me the title error, next time its work fine
if i dont change the parameters to be the second choise.
I hope i make it clear so you can help me.
Thank You.

VisualBasic 6
Crystal Report 8.5
SQL Server 2000
Windows XP