Most of you would be like me and I don't want to waste time waiting for help so that my Blockland will work again, But please Please post you're Consoles so we mite identify you're straight away rather waiting for a second post with the Console.
To post you're console click "Browse..." below the text area then go into you're Blockland directory which would be C:/Program Files/Blockland and click console.txt and click "Open". Be sure to run Blockland and recreate this error before uploading it so we get the most information.