Error when i try to save a form from View...

Unhandled Exception: System.ServiceModel.FaultException`1[[Microsoft.Xrm.Sdk.OrganizationServiceFault, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: New_assignprojects With Id = 1fdfce81-dac4-e111-9e24-00219b9a7968 Does Not ExistDetail:
<OrganizationServiceFault xmlns:i=" xmlns=">
  <ErrorCode>-2147220969</ErrorCode>
  <ErrorDetails xmlns:d2p1=" />
  <Message>New_assignprojects With Id = 1fdfce81-dac4-e111-9e24-00219b9a7968 Does Not Exist</Message>
  <Timestamp>2013-08-21T12:50:24.691233Z</Timestamp>
  <InnerFault i:nil="true" />
  <TraceText i:nil="true" />
</OrganizationServiceFault>