Call Directory Extension - Error enabling extension. Failed to request data

Question

Our application uses the caller ID feature for the Call Directory Extension. This seems to work well for most users. However, one user reports that he cannot enable the extension in Settings> Phone> Block and call identification. It receives the message "Error enabling extension." Failed to request data for application name. You can try turning on the extension again ... "So far I have not been able to reproduce this. Has anyone else seen this? What was your solution?