Sentis package installs but fills console with errors

I see a slew of ‘namespace X could not be found’ after installing the Sentis package.

For example:

Library\PackageCache\com.unity.sentis@1.4.0-pre.3\Runtime\Core\Backends\TensorClassPool.cs(16,36): error CS0246: The type or namespace name ‘Tensor’ could not be found (are you missing a using directive or an assembly reference?)

I tried installing both the 1.4 and 1.3 packages.

I have Barracuda installed and it seems to load fine. And it has a Tensor class, but they seem like different implementations.

I see that it seems like Sentis is replacing Barracuda.
https://docs.unity3d.com/Packages/com.unity.sentis@1.1/manual/upgrade-guide.html

Wish your publications and website did more to make this clear.

are you installing barracuda and sentis?
sentis is the upgrade to barracuda. start with a fresh project