Error when attaching PDF to payables voucher in GP 10.0

One of our accounting personnel encountered this error when trying to attach a PDF to a payables voucher in GP 10.0. The problem started this morning and no changes have happened to the system, network, or servers. User is on a Win7 machine. I inherited the current setup from a previous Administrator so my knowledge of GP is limited to the basics (I can be walked though just about anything). This is the only error the user has reported to me so it looks like everything else GP related is working fine. Here are the details from the error report:

System.ServiceModel.FaultException`1[System.ServiceModel.ExceptionDetail]: Error adding Documents for ParentID(s) :VCH00000000048287;.Error occurred while adding document DMCA Inv 370.pdf for Parent ID:VCH00000000048287, Transaction Type: 1

Error Detail: The type initializer for '<Module>' threw an exception.

Stack: at System.Runtime.CompilerServices.RuntimeHelpers._RunClassConstructor(IntPtr type)

at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

at System.Reflection.ConstructorInfo.Invoke(Object[] parameters)

at Microsoft.SharePoint.Administration.SPAutoSerializingObject.GetInstanceFromType(Type type)

at Microsoft.SharePoint.Administration.SPPersistedObject.GetInstance(XmlNode xml, Guid classId)

at Microsoft.SharePoint.Administration.SPFileSystemCache.FetchObjectFromFileSystem(Guid id)

at Microsoft.SharePoint.Administration.SPFileSystemCache.GetValue(Guid id)

at Microsoft.SharePoint.Administration.SPCache`2.get_Item(K key)

at Microsoft.SharePoint.Administration... (Fault Detail is equal to An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:

System.Exception: Error adding Documents for ParentID(s) :VCH00000000048287;.Error occurred while adding document DMCA Inv 370.pdf for Parent ID:VCH00000000048287, Transaction Type: 1