Lightning spear stopped working

I can't even put it on the skills shortcut bar.
I have all the necessary attributes to use it.

Today I managed to create a new skill gem from scratch and it worked, but my old one doesn't work, and when I put the old one in, the new one stops working again :/ :/ :/


I thought it had started working again, but it didn't, as soon as I enter the map, I can't use the skill anymore, so it still doesn't work but now it shows the status and I can put it on the bar, but I can't use it.