When I attempt to enter registration data, the system crashes and the following message appears ‘CXC's Online Registration System generated an error. Please try the application again, and if the problem persists then please contact your Local Registrar with your centre number and the details of what you were doing when the error occurred’. 

Errors like this one tend to be of a technical nature and generally have to be resolved by a person with technical skills. Kindly contact the CXC Local Registrar.