Bug in Mendix Studio Pro 8.1.0?

Hi, When configuring the Call REST service, creating/editing a parameter for Location, Studio Pro does not tolerate the ‘.’ character in the variable name. In the screenshot below, $Input is an object, and Title is a string variable on it, but Studio Pro reports it as an error. This prevents does not let the application run. The same thing works in the training video on https://docs.mendix.com/howto/integration/consume-a-rest-service, at 3:31. Any one knows a workaround?  
1 answers

have you try this way with /