Command blocks are normally a requirement for adventure maps. So if your adventure map is not working double check you have enabled command blocks.

To enable command-blocks on your Minecraft server, log into Multicraft, select and stop your Minecraft server and follow these steps:

1. On the left hand side of your control panel click "Config Files"Choose the first file named "Server Settings"
2. Scroll down to the Enable Command Block field.
3. Select "Enabled" from the drop down box.
4. Click "Save"
5. Start your Minecraft server.

If you do not see the Command Block field, go onto your server, and place a Command Block down. Then follow the steps above.