Sibling link problem

Hi, I have this problem I can't fix with disk utility, the symptoms are: sometimes after booting up, finder is not responding so I have to reboot several times, and the second symptom is that sometimes I cant save files from the internet (even a 100 Kb file) safari says that there is no space in my hard drive (even though I have more than 120 Gb free in that partition... the OS partition)

So I googled it and found this: (See first picture)

and after doing it that's what I get: (see second picture)

any ideas how to fix it? thank you guys.

you may want to open the attached images in a new tab to see them bigger