OpenStudio Error: <root>[Site:Location] - Object name cannot be blank

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Hello, i am a very beginner user of openstudio, and in all of my projects the follow error occurs :

** Severe  ** <root>[Site:Location] - Object contains properties that could not be validated using 'properties' or 'additionalProperties' constraints
** Severe  ** <root>[Site:Location] - Object name is required and cannot be blank or whitespace

How I can resolve these ? I tried something in materials but I don't understand too much.

Thanks guys