[DotNetDevelopment] Crystal report error - Unknown Query Engine Error

[Dhananjay]

Hi All,
I have created one Outlook addin using VSTO / Office 2007 / VB 2005
(with VS 2005 SP1).
I have created one .Net dll in which I have created a crystal report.
On clicking a button in custom form, I am calling the function in .Net
dll to create a

report. I took following steps to create a report using dataset.

1> Create a new crystal report -> Using the Report Wizard -> Standard -
> Create New Connection -> Database Files
2> Here I choose the xml (say, c:\ReportRecords.xml ) file that should
I use as the report's datasource.
3> Choose the tables from xml file, filter records, group records etc
& finally create a report.
4> Following is my code snippet to create a report & dynamically set
the datasource to dataset.
******************************************************************************************************************************************


        ' Create one xml document say, xmlDoc, programmatically which is the
same as the datasource of crystalReport1.rpt
        .....

        .....


        ' After document is generated create a dataset from that document
            Dim nodeReader As New XmlNodeReader(xmlDoc)
            Dim settings As New XmlReaderSettings()

            Dim myXMLReader As Xml.XmlReader
            myXMLReader = XmlReader.Create(nodeReader, settings)

            ' Create a Dataset
            Dim ds As New DataSet
            ds.ReadXml(myXMLReader)

        ' Instance of form on which I am having ReportViewer control.
            Dim frm As New dlgReportViewer
            Dim myReport As New CrystalReport1()

        ' Set the datasource of report to newly created ds
            myReport.SetDataSource(ds)
            frm.ReportViewer.ReportSource = myReport


******************************************************************************************************************************************

I am always getting exception at the line "myReport.SetDataSource
(ds)" when I call this function from outlook custom form and the
exception says
"Unknown Query Engine Error
Error in File <temp folder path>\temp_d8c08404-
ff70-4857-9145-97772cc9e8eb {C88D8F59-C709-4E8E-
B35E-6B107DCA7239}.rpt:
Unknown Query Engine Error". I can run other functions in .net dll
through custom form without any problem, but only in this function,
specifically while

setting the datasource, I am getting exceptions.

I set the permissions of crystal report directory to FullTrust also
but the same problem happens again.

Note that if I call this function from any other project than outlook
Addin, it works! I created a windows exe project & added the reference
to the dll &

call the function to generate the report. It works perfectly!

Please help me to solve this problem.


Thanks in advance,
Dhananjay