We evaluated Team Calendar a while ago, but didn't find it particularly useful for us (yet another calendar)
How do I remove the error message shown on the main Confluence dashboard? (see attachment)
You should be able to disable the plugin and the error should go away. Please see: https://confluence.atlassian.com/display/DOC/Disabling+or+Enabling+a+Plugin
It looks like your attachemnt did not come through in the original message either, so I'm not sure what the error is.
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