You're jumping to a conclusion here without explaining the premise. What is the problem exactly? What error do you encounter? Post your launcher.log and console.log files.
I can't play blockland normally, because there is somekind of error, what makes this problem: I need to enter my authencation key everytime i start my computer and then blockland, and my Return to blockland isn't working neither. I want to fix it. here is the console and launcher: