Can't select Field Calculator for some feature classes

Discussion created by conor.moloney on Aug 6, 2013
Latest reply on Aug 6, 2013 by conor.moloney
To change the data type of a field, I've added a new field and I want to use the field calculator to copy the values in the original field. But for some feature classes I cannot select the field calculator. Does anyone know why this might be happening? [ATTACH=CONFIG]26487[/ATTACH]