cant

Not sure what would cause this or if anyone else has come across it, but I can not place any type of slabs.... in my cmd console for my server it states, I don't have enough in the slot to build with, when in fact I have 20. Picture of error and proof of myself having 20 of said 1/4 slabs (ok...

Hello, i am new to the game and to the community. So i have a question. No mater what i do to my ship, it always ends up being too week to leave a planets atmosphere. Am i doing something wrong?? I have at least 30 thrusters on it with 100 percent power.