Why Chandrayaan-2 launch called off?

ISRO scientists have worked rigorously to fix the problems in Chandrayaan2, for which the launch was deferred. The lunar mission was aborted 56 minutes and 24 seconds before the launch as the team found out there was a leak in the cryogenic engine to a helium gas bottle. The issue can be fixed without dismantling the rocket. However, the officials are trying to find out the reason for the leak to stop it from re-occurring.