resource pack model not working

[copper sigil]

!faq invalid-names

[urban meteor]

Files/Folders nor reference to them are allowed to contain capital letters nor spaces.
Valid symobls are: a-z (lowercase only!) 0-9 / . _ and -

When changing a file's/folder's name, keep in mind that you also need to update all references (texture path in models, model paths in custom_model_data predicates etc.)
Disclaimer: Optifine allows those characters but for a vanilla client the model will either be the error cube or it might even crash their game (depending on their specs).