mail error

Traceback (innermost last):
  Module ZPublisher.Publish, line 138, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 48, in call_object
  Module plone.z3cform.layout, line 66, in __call__
  Module plone.z3cform.layout, line 50, in update
  Module collective.easyform.browser.view, line 256, in update
  Module plone.z3cform.fieldsets.extensible, line 59, in update
  Module plone.z3cform.patch, line 30, in GroupForm_update
  Module z3c.form.group, line 145, in update
  Module plone.app.z3cform.csrf, line 21, in execute
  Module z3c.form.action, line 98, in execute
  Module z3c.form.button, line 315, in __call__
  Module z3c.form.button, line 170, in __call__
  Module collective.easyform.browser.view, line 159, in handleSubmit
  Module collective.easyform.browser.view, line 122, in processActions
  Module collective.easyform.actions, line 463, in onSuccess
  Module collective.easyform.actions, line 399, in get_mail_text
  Module collective.easyform.actions, line 198, in get_mail_body
  Module Products.PageTemplates.ZopePageTemplate, line 435, in pt_render
  Module Products.PageTemplates.PageTemplate, line 87, in pt_render
  Module zope.pagetemplate.pagetemplate, line 126, in pt_render
   - Warning: Compilation failed
   - Warning: chameleon.exc.ParseError: Unexpected end tag.

 - String:     "</html>"
 - Filename:   mailer
 - Location:   (line 16: col 0)
PTRuntimeError: ['Compilation failed', 'chameleon.exc.ParseError: Unexpected end tag.\n\n - String:     "</html>"\n - Filename:   mailer\n - Location:   (line 16: col 0)']