Kernel.cpp Line 20

// Hard checkpoints of stake modifiers to ensure they are deterministic
static std::map mapStakeModifierCheckpoints =
    boost::assign::map_list_of
    ( 0, 0x0e00670bu )
   ( 124000, 0xe791f02cu )
    
    ;

It looks like block 124000 is looking for 0xa4251ce5b54ee576 but got 0xe791f02cu in checkpoints array.