Discoverer Plus - New parameter creation

On a worksheet in Discoverer Plus, when I click on Parameters and then click on New it throws an error:
An error occurred while attempting to perform the operation. The operation did not complete successfully.
Extra Internal Info
(OLException
Cause: OLException {
Code: OLCmRefException:eNullRef
Args: OLCmRefException:eNullRef
Have anyone received this error before?
Thanks

just we got this error and
to solve this issue we gave BA access privilege to that user.
On a worksheet in Discoverer Plus, when I click on
Parameters and then click on New it throws an error:
An error occurred while attempting to perform the
operation. The operation did not complete
successfully.
Extra Internal Info
(OLException
Cause: OLException {
Code: OLCmRefException:eNullRef
Args: OLCmRefException:eNullRef
Have anyone received this error before?
Thanks

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Edited by: SachinK on Feb 26, 2009 1:26 PM

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Pl identify the OS you are installing on.
>
1.during database installation "EM.EAR" missing.
>
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Discoverer Plus - New parameter creation

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