Error  "/System/Library/Extensions/CMSLogicalUnitDriver3.kext"

I get the following error when my external hard drive mounts: "/System/Library/Extensions/CMSLogicalUnitDriver3.kext" what is this and how do I fix it

That's not a Mac OS file. It's some third-party software you installed, possibly from this developer:
Backup Software | Data Security Solutions | Server Backup

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