Today I got this error:

I tried to deploy a simple form to the SharePoint location http://sharepoint.local. – This location is a root site collection!!!

I got the error:

The following URL is not valid: “http://sharepoint.local”

I swear: It is valid!!!

The URL uses a host header name. Specifying the Central Administration URL (using the machines name) did work at the same time.

Than I activated the network adapter of the virtual machine to have Google available in the machine to research into the problem. – In this moment the problem was gone! – I turned off the network adapter and the problem was back. – OK. That’s it. – Deactivating the “System Event Notification Service” (net stop sens at command line) solved the problem. But you should restart the service as soon as possible!