Boost libraries disabled after migration of new checkers

Before Migration of starters the submission for the problem existence ,CodeChef: Practical coding for everyone boost libraries got accepted 1 month ago
But after migration, the submission CodeChef: Practical coding for everyone shows compilation error for the exact same code which was done 6 days ago.
What’s bug on this?

Hey, yes they are not installed on the sandbox. Will install them in a few days.