error: Unable to find 2bc2d0940b54858d71ea2c1b6aa6b27bc9bab506 under Index of /meta-lxde.git
~/oe-core$ vim .repo/manifest.xml
It looks like your trying to checkout LinuxImageV2.4.
Said commit is part of meta-lxde. Can you try some time later to see if it is an temporary problem, if not can you post the full error message when you run repo sync?