A fatal error occurs in ArcCatalog after clicking the Add button in the Choose Reference Data dialog box when looking for a shapefile to use as reference data.
This error can occur if the Normal.gxt file is corrupted.
1. If VBA code has been added to Normal.gxt, export the affected modules.
2. Exit ArcCatalog.
3. Navigate to the folder that contains the Normal.gxt file. In Windows NT, this file is located under:
C:\winnt\profiles\<your user name>\Application Data\ESRI\ArcCatalog\
C:\Documents and Settings\<your user name>\Application Data\ESRI\ArcCatalog
4. Rename the existing Normal.gxt file.
Deleting the Normal.gxt file causes a loss of customizations that were made in ArcCatalog, including VBA code.
5. Start ArcCatalog.
6. If VBA code was exported in step 1, import it into the new Normal.gxt file.