Error 1099 when creating express VI from a VI

I am trying to create a new express VI from an existing VI and am getting the following error:

Error 1099 occurred at Property Node (arg 1) in byob_Create Controls & Inds.vi->byob_GUI Create Block.vi->Block Builder Wizard.vi

Possible reason(s):

LabVIEW: Scripting: SubVI is not loaded.

Property Name: VI Name

This error happens after doing the following:

1. Open the Create or Edit Express VI dialog

2. Click New

3. Select the Create from a VI radio button and click Next

4. Select the VI to make the express VI from and click OK

5. Click Next without changing the defaults for the terminals

6. Enter an Express VI name (use the default path) and click Finish

I am wondering what might be causing this error and how to correct the trouble.