com.portal.pcm.FlistToXML displaying UnknownField<field#> instead of field name

How do you display its name instead of the UnknownField? I already have the customfield jar in the classpath.

User is using com.portal.pcm.FlistToXML to convert FLIST to XML. However, they are encountering problems if they use FLIST with custom fields.

Sample
0 PIN_FLD_PAYINFO              ARRAY [0] allocated 4, used 4 1 PIN_FLD_INHERITED_INFO   SUBSTRUCT [0] allocated 2, used 2 2     PIN_FLD_INV_INFO     ARRAY [0] allocated 6, used 6 3     SKY_FLD_INV_INFO     ARRAY [0] allocated 7, used 7 4         SKY_FLD_STREET_TYPE STR [0] "Road"
<bus:PAYINFO elem="0">         <bus:INHERITED_INFO>             <bus:INV_INFO elem="0">                 <bus:UnknownField10140 elem="0">                     <bus:UnknownField10073>Road</bus:UnknownField10073>                 </bus:UnknownField10140>             </bus:INV_INFO>