Document.Modify Isn't working

[lrhammar]

I'm a pretty noob programmer. I've been using the multiprojectsolution template to create addins but all of a sudden Document.Modify, the Modify isn't contained in the definition.

I am pretty sure it has something to do with the Nice3point.RevitToolkit but I dont know how to fix this.
Do I uninstall/reinstall it? It appears to have multiple versions installed.

[Nice3point]

Document.Modify is a deprecated method and it is removed in the preview package version. use new Transaction(document) method instead