With reference to https://kc.mcafee.com/corporate/index?page=content&id=KB70194, I assume that you are using Change Control. In case you are using Application Control then it is not supported.
If you have further query, please respond with version of Solidcore installed and Linux kernel. For further analysis you can also open a service request and provide detailed logs.
I just noticed "I started a solidify of the /volume", which means you are using Application Control. Please refer to KB70194.