Hi  All I am Getting Following Error when try to access custom object in flex . if any bod knows please reply me as soon as possible.

Fault from operation: (com.salesforce.results::Fault)#0
  detail = (Object)#1
    fault = (Object)#2
      column = -1
      exceptionCode = "INVALID_TYPE"
      exceptionMessage = "sObject type 'npe5__Affiliation__c' is not supported."
      row = -1
      xsi:type = "sf:InvalidSObjectFault"
  faultcode = "sf:INVALID_TYPE"
  faultstring = "INVALID_TYPE: sObject type 'npe5__Affiliation__c' is not supported."