Error when starting Dynamo from Revit

Hi everyone,
I have just download and installed Dynamo for Revit from this page
But when I try to start the program from Revit 2018, I get this error message :
Can someone help me to solve this?

Try updating your Revit version to 2018.3.2.

Yes, thank you answering.
I think the problem was coming from a bad uninstalling of a previous version.
I uninstall all dynamo-linked programs and cleaned the registry with Microsoft Fixit Tool and it’s working now.