/site-packages/angr/exploration_techniques/tracer.py", line 135, in step_state raise Exception("All states disappeared!")

[svbar]

I am getting this error when i run driller -

Traceback (most recent call last):
  File "run_driller3.py", line 70, in <module>
    main()
  File "run_driller3.py", line 57, in main
    for _, new_input in Driller(binary, seed, fuzzer_bitmap).drill_generator():
  File "/home/sy/virtual-1/lib/python3.6/site-packages/driller/driller_main.py", line 101, in drill_generator
    for i in self._drill_input():
  File "/home/sy/virtual-1/lib/python3.6/site-packages/driller/driller_main.py", line 141, in _drill_input
    simgr.step()
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/misc/hookset.py", line 75, in __call__
    result = current_hook(self.func.__self__, *args, **kwargs)
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/exploration_techniques/driller_core.py", line 39, in step
    simgr.step(stash=stash, **kwargs)
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/misc/hookset.py", line 75, in __call__
    result = current_hook(self.func.__self__, *args, **kwargs)
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/exploration_techniques/tracer.py", line 115, in step
    return simgr.step(stash=stash, **kwargs)
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/misc/hookset.py", line 80, in __call__
    return self.func(*args, **kwargs)
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/sim_manager.py", line 343, in step
    successors = self.step_state(state, successor_func=successor_func, **run_args)
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/misc/hookset.py", line 75, in __call__
    result = current_hook(self.func.__self__, *args, **kwargs)
  File "/home/sy/virtual-1/lib/python3.6/site-packages/angr/exploration_techniques/tracer.py", line 135, in step_state
    raise Exception("All states disappeared!")
Exception: All states disappeared!

Any clue? what is wrong or how to go about debugging this ?

Thanks in advance