I am also having the same issue when I select the mailing list in the Mailchimp subscription module:
Invalid controller: name='plugin', format=''
I am using CMC v1.4 in Joomla v2.5.22 with NoNumber Advanced Module Manager v4.15.0PRO
Any ideas what I can do to remedy this? Perhaps AMM has changed something... They do updates all the time.
Thanks in advance,