attack of the b team What is going wrong

[TechnicNoobZhua]

Hello, i am having an issue with my Attack of the B Team Hamachi server. I have created the server and the mod pack works fine in the sense that people can join and play. However, with the new block added with the mod pack there has been issues, (I tested and discovered this whilst in creative upon first joining the game) if the block isn't included in vanilla Minecraft then when going to place it it vanishes and if the block is in vanilla but is an alteration it just places the original vanilla block. Like i said i was using creative so i spawned the block in through the creative menus. Does anyone know of this issue or even better a solution to it. Thank you for taking the time to read this, any help is appreciated.

[EvilOwl]

You have not created a Attack of the B-Team server. You created a vanilla server so all moded blocks are being deleted.

You probably started the server with the minecraft_server.jar, that's wrong.

There should be a launch script in there to run the server. Use it.