Unable to retrieve Object.Error in File: Unknown Database Connector Error

Hi,
I have deployed two report on BO XI server. Both the reports are designed in Crystal Report designer XI.
I got all database credentilas, saved in CMC by my administrator so that these reports should not prompt me for any database login parameters when I am trying to run them from BOXI test server.
When I am running one of my report, the report is working fine. But this is not the case with other report.
This second report is working well with some inputs.
Case 1 - It is having to input date parameter(Date1 and Date2), when I am entering one input date parameter (Date1) and other (Date2) is set to NULL, it is displaying correct result. But when I am giving any date for Date2 it is throwing me an error -
"Error in File Manager_Agent_Report.rpt: Unknown Database Connector Error
Unable to retrieve Object.
Error in File Manager_Agent_Report.rpt: Unknown Database Connector Error "
Case 2 - Similiarly it is having an other input field which I am using in filetering the records in Report.
If I am setting it to NULL or If I am not giving this field, while entering the input. I am getting an output.
But incase I am giving this particular field then again it is promptig me the  above mentioned error.
The report are working fine if I am executing them from crystal report designer.
Please help me to find a solution for the same.
Thanks
Deepak

Deepak, firstly are you trying to connect to one database or two in these reports? I would check the ODBC connections both in server and client machine (testing server or whatever you testing it on). Make sure both connection settings are exactly the same.
Secondly I will check the parameters values under Objects under the CMC and see if there is anything changed there.
Report back if you have checked both and it still giving errors
Regards
Jehanzeb

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