Updating 3.0 to 3.4

I’ve been trying to update my project, which was made in MonoGame 3.0, to 3.4.
When I tried to do so, I got an error saying it couldn’t build because the path to MonoGame.ContentPipeline.Targets.
Am I doing something wrong, or am I not supposed to update it?

Any help is welcome

We’ve switched to our own implementation of the content pipeline since the 3.0 version of MonoGame.

I recommend creating a new project from the project templates and get a feel for how things work now. You can then figure out how to best map your existing game to the new content processing.