Space, tab, etc chars are usually illegal to be used in object names unless the names are quoted. That probably is the case for your databases. For most databases, space will be an illegal name to be used for object names.
In your model, the "Allow special characters" should be turned on; and if turned on then you should not see the error/warning above.
We will fix it so it won't flag such naming errors when "Allow special characters" is on.
For now, you can uncheck the validation option for "Objects with no standard names".
Hope this helps.
ModelRight Evangelist