Weird "strict standards" message

I am seeing the following message on most screens. In addition, plugins that are added are no longer appearing in the admin menu. Eg: I added the member and the appointment plugins but they are not appearing on the admin menu.

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Strict Standards: Redefining already defined constructor for class AppointmentsGcal in E:WordPressSitesWordPress01-nCubeSoftwarewordpresswp-contentpluginsappointmentsincludesclass.gcal.php on line 26
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PS: I tried posting this message from the dashboard inside wordpress but it looked like it never posted because the whole dashboard just stayed dimmed with but "posting question" button staying animated. I came to the site directly to see if it was posted and of course, it was.