Can't build slate walls?

[Scoobearychu]

theres some slate walls in my world and i wanted to continue on building some more slate walls around it but when i try to the option doesnt come up in the build wall thing... im not sure what i could do...

[Wowee]

You need a stonecutters' table to craft blocks.

[Scoobearychu]

thanks :3

[jie]

You need the material for the option to show up.