signit does not gives error message

I am unable to use the signit moudle.Below are the symptoms.Please let me know if you need furthur information

When I create a node I get this warning

warning: htmlspecialchars() expects parameter 1 to be string, array given in C:\WAMP\www\XXX\includes\bootstrap.inc on line 631. warning: htmlspecialchars() expects parameter 1 to be string, array given in C:\WAMP\www\XXX\includes\bootstrap.inc on line 631

and when I try to add a signature I get this error

user warning: Unknown column 'data' in 'field list' query: INSERT INTO signit_signatures (nid, uid, targets, subject, message, personal_message, personal_comment, created, sent, email, firstname, lastname, data) VALUES (530, 20, "", "My SignIt ", "", "", "", 1214600670, 0, "XXXXX", "Admin", "", "N;") in