Crystal Clear Class Err



Dear All,
I have a clarion software which is previewing Crystal report XI from
crystal clear class. But when I try to preview the report it show me
an error telling "Unable to connect : incorrect log on parameter
Detail : Database vendor code 18456.

My Parameter are :
re = CrystalReport.Init('PR.rpt')
re =CrystalReport.SetAllTablesLogOnInfo('BIS','','it','dba',true)

re = CrystalReport.EmbeddedPreview()

Thanks
.