Error props in my second account

I have 2 accounts for gmod in my first account I see everything well but in my second account I see some props with error.
I heard somewhere that can come from wrong steam ID ?

Here an example

Primary https://postimg.org/image/ofleir8xl/
Secondary https://postimg.org/image/5ksx7fqr5/

I have all file css hl2 etc… but I cant check the box in my secondary account
https://postimg.org/image/oordvo1fh/

have you also installed the games for the props under the 2nd account ?

Both accounts must own the games you are trying to mount.

I have 1 file garry’s mod for both account

I bought gmod for the both account

What he means is the content you are trying to mount must come from a game that is own by the account on which you are playing garrysmod.

That you own garrysmod on both accounts is obvious.

I just fix it I set my primary account with steam Family to my second account