Track down UI error

Please get me started on tracking down this error
Problem is that I bind to a lot of FieldValue and clearly not all are failing or I would be getting a lot more of these errors

Convert 
System.Windows.Data Warning: 56 : Created BindingExpression (hash=44291519) for Binding (hash=2717082)
System.Windows.Data Warning: 58 :   Path: 'FieldValue'
System.Windows.Data Warning: 56 : Created BindingExpression (hash=4012957) for Binding (hash=2717082)
System.Windows.Data Warning: 58 :   Path: 'FieldValue'
System.Windows.Data Warning: 62 : BindingExpression (hash=4012957): Attach to System.Windows.Controls.TextBox.Text (hash=30313526)
System.Windows.Data Warning: 67 : BindingExpression (hash=4012957): Resolving source 
System.Windows.Data Warning: 70 : BindingExpression (hash=4012957): Found data context element: TextBox (hash=30313526) (OK)
System.Windows.Data Warning: 78 : BindingExpression (hash=4012957): Activate with root item DocFieldDecimalSV (hash=12144638)
System.Windows.Data Warning: 107 : BindingExpression (hash=4012957):   At level 0 using cached accessor for DocFieldDecimalSV.FieldValue: RuntimePropertyInfo(FieldValue)
System.Windows.Data Warning: 104 : BindingExpression (hash=4012957): Replace item at level 0 with DocFieldDecimalSV (hash=12144638), using accessor RuntimePropertyInfo(FieldValue)
System.Windows.Data Warning: 101 : BindingExpression (hash=4012957): GetValue at level 0 from DocFieldDecimalSV (hash=12144638) using RuntimePropertyInfo(FieldValue): <null>
System.Windows.Data Warning: 80 : BindingExpression (hash=4012957): TransferValue - got raw value <null>
System.Windows.Data Warning: 82 : BindingExpression (hash=4012957): TransferValue - user's converter produced ''
System.Windows.Data Warning: 89 : BindingExpression (hash=4012957): TransferValue - using final value ''