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Upgrade from 3.2 to 4.0: report problems

Hi,
I have just upgraded SpiraTest from 3.2 to 4.0.
When I try to open report page, I have the following message:
A system error has occurred... Please click on the 'My Page' link to return to the application
Offending URL: __Page
Source: System.Web
Message: Cannot deserialize the blob of personalization data associated with the current page. Parameter name: data
Stack trace: at System.Web.UI.WebControls.WebParts.BlobPersonalizationState.DeserializeData(Byte[] data) at System.Web.UI.WebControls.WebParts.BlobPersonalizationState.get_UserState() at System.Web.UI.WebControls.WebParts.BlobPersonalizationState.ApplyPersonalization(Control control, String personalizationID, Boolean isWebPartManager, PersonalizationScope extractScope, GenericWebPart genericWebPart) at System.Web.UI.WebControls.WebParts.BlobPersonalizationState.ApplyWebPartManagerPersonalization() at System.Web.UI.WebControls.WebParts.WebPartManager.TrackViewState() at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

How can I correct this problem?
Thank you

Nathalie

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