Shoot projectile block not working? (SOLVED)

I am trying to make an item that throws a custom projectile, which I was able to make the code and projectile. However, I can only use this in creative mode and it won't work in survival mode. I tried to use the shoot projectile block (image in link provided) but it wont let me insert anything, and it shows a blank puzzle piece. I tried to insert every block I could find and searched up any issue but to no avail. Is there a fix to this, thanks. https://imgur.com/a/JP2qxVU