Error reported when changing Field Name

Error reported when changing Field Name

I recently added a field on an existing form.  The field was added and it shows up fine but the Field name is set to "Single Line".  When I change the name to something more meaningful it displays "Saving Changes ..." at the top of the page and then eventually displays a pop up saying "Exception occured while publishing message to the topic :: [DataModelTopic]". 

I read in the forum about this error and it was mentioned it could occur if there are too many fields on the form.  I deleted a few fields that were unneeded but it still didn't help.

Any help would be appreciated.