Form report strange error on sending

Form report strange error on sending

Hi,
I have a form that run correctly, but today report this error when click on send:

1 . [t_92720000002162027] Exception occured while setting value in PreparedStatement for the Column [Data_pagam_92720000002329055] Check whether the datatype for this column is given as specified in the data-dictionary .[t_92720000002162027] Exception occured while setting value in PreparedStatement for the Column [Data_pagam_92720000002329055] Check whether the datatype for this column is given as specified in the data-dictionary

This is the form
http://www.creator.zoho.com/misca/lezioni-live/#Form:Comunicazione_pagamento

Thanks
Mic