lack textur materials in the material panel

[CAROLINA]

Sorry I happened not to have some textures in the revit material panel.
they are not materials with textures created by me, but they are the default ones, I would not have accidentally deleted the equipment of materials that you install by installing the program. How can I solve this? ? ?
thanks and a thousand
carolina

 

[Tristan]

reinstall material library

 

[CAROLINA]

All right, thank you.
Sorry I wrote several times, but I didn't notice.
Thanks for always helping me.... .