messenger-smime

I recently ran an on-line update and since then can not SEND mails from Thunderbird. Receiving is OK.

The error mask reads:

% messengercomposeDTD;
Chrome://messenger/contect/messengercomposer/messenger compose.xul
Zeile (Line) Nr. 9 Spalte (column) 1

Doctype overlay system"Chrome://messenger-smime/locale/msgCompSMIMEOverly.dtd"

%editoroverlay DTD;

What has happened? Who can help here please?

Many thanks in advance.

Williwins