I dont seem some props of HL2!!!!!

Hello, I bought Garry’s Mod for some time, always played normally but has recently begun to show problems, some props from Half-Life 2 stopped appearing, I could handle them but I could not see them. Also this error appears on the console when I look at the prop "invisible ". Already reinstalled Garry’s mod, delete its folder and did other things. I would like to know what I could do.
(sorry for my English I am Brazilian and I’m using Google translator)

Try verifying Half-Life 2’s cache.

There is nothing wrong with your English.
But, do you have any errors in console?