7.50 update warns of missing D6 CTM module

Hi,
I have updated to 7.50 and received a number of warnings about missing modules. Most I have now fixed but this one ..
User warning: The following module is missing from the file system: ctm. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1138 of /home/blatchin/public_html/includes/bootstrap.inc).
looking for the CTM module. I am having problems trying to find a D7 CTM module. Does such a thing exist? If so where, if not how do I resolve this warning?
Thanks

Drupal version: 


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