Error exporting to Excel from Management Reporter

When trying to export directly to excel from MR 2012, we are getting and HTTP:500 error. We then exported to MR library and tried to export from there and got the following:

Problem signature:

  Problem Event Name: CLR20r3

  Problem Signature 01: reportviewer.exe

  Problem Signature 02: 2.1.0.0

  Problem Signature 03: 51f883cb

  Problem Signature 04: Microsoft.Dynamics.Performance.Reporting.Viewer.Pipelines.Native

  Problem Signature 05: 2.1.0.0

  Problem Signature 06: 51f88395

  Problem Signature 07: 1003

  Problem Signature 08: 216

  Problem Signature 09: System.NullReferenceException

  OS Version: 6.1.7601.2.1.0.16.7

  Locale ID: 1033

  Additional Information 1: a552

  Additional Information 2: a552a19b75efd34a1ba7dea45344ac5f

  Additional Information 3: a1ea

  Additional Information 4: a1ea96775ec0c16b917941114ed301a1