When creating new records in any entity getiing error in mscrm 2011

Dear all;

when i try to create new record in any entity for example opportunity i am getting this error 

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Server was unable to process request.Detail:

<OrganizationServiceFault xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.microsoft.com/xrm/2011/Contracts">

  <ErrorCode>-2147023878</ErrorCode>

  <ErrorDetails xmlns:d2p1="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />

  <Message>Server was unable to process request.</Message>

  <Timestamp>2013-09-04T12:10:21.3522306Z</Timestamp>

  <InnerFault i:nil="true" />

  <TraceText i:nil="true" />

</OrganizationServiceFault>

please help