I’m sorry to hear you’re having concerns about your Chromecast. This is also the first time I'm hearing about this kind of message. Do you have a photo perhaps?
In any case, follow the steps in the help article below that shows how to find the reset button on every model of Chromecast. It's always on the edge of the Chromecast itself, near to the power input. Once you've found the reset button, follow the steps in the next help article to factory reset your Chromecast.
Keep me posted.