Not a DOI
The resolution service at https://doi.org resolves DOIs. You have attempted to resolve public/site/images/administrador/Captura_de_Pantalla_2020-03-21_a_la(s, which is not a DOI.
public/site/images/administrador/Captura_de_Pantalla_2020-03-21_a_la(s may be a Handle (DOIs are a special sort of Handle). If public/site/images/administrador/Captura_de_Pantalla_2020-03-21_a_la(s is a valid Handle you should be able to resolve it at https://hdl.handle.net.
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