pyttsx3: pyttsx3 not working in ubuntu.

when i run the sample pyttsx3 code .

import pyttsx3

engine = pyttsx3.init()
engine.say("hello")
engine.runAndWait()

i get the following error:

Traceback (most recent call last): File “/home/sivaramakrishnan/.local/lib/python3.6/site-packages/pyttsx3/init.py”, line 44, in init eng = _activeEngines[driverName] File “/usr/lib/python3.6/weakref.py”, line 137, in getitem o = self.datakey KeyError: None

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File “speaker.py”, line 3, in <module> engine = pyttsx3.init() File “/home/sivaramakrishnan/.local/lib/python3.6/site-packages/pyttsx3/init.py”, line 46, in init eng = Engine(driverName, debug) File “/home/sivaramakrishnan/.local/lib/python3.6/site-packages/pyttsx3/engine.py”, line 52, in init self.proxy = driver.DriverProxy(weakref.proxy(self), driverName, debug) File “/home/sivaramakrishnan/.local/lib/python3.6/site-packages/pyttsx3/driver.py”, line 75, in init self._module = importlib.import_module(name) File “/usr/lib/python3.6/importlib/init.py”, line 126, in import_module return _bootstrap._gcd_import(name[level:], package, level) File “<frozen importlib._bootstrap>”, line 994, in _gcd_import File “<frozen importlib._bootstrap>”, line 971, in _find_and_load File “<frozen importlib._bootstrap>”, line 955, in _find_and_load_unlocked File “<frozen importlib._bootstrap>”, line 665, in _load_unlocked File “<frozen importlib._bootstrap_external>”, line 678, in exec_module File “<frozen importlib._bootstrap>”, line 219, in _call_with_frames_removed File “/home/sivaramakrishnan/.local/lib/python3.6/site-packages/pyttsx3/drivers/espeak.py”, line 5, in <module> from . import _espeak, toUtf8, fromUtf8 File “/home/sivaramakrishnan/.local/lib/python3.6/site-packages/pyttsx3/drivers/_espeak.py”, line 18, in <module> dll = cdll.LoadLibrary(‘libespeak.so.1’) File “/usr/lib/python3.6/ctypes/init.py”, line 426, in LoadLibrary return self._dlltype(name) File “/usr/lib/python3.6/ctypes/init.py”, line 348, in init self._handle = _dlopen(self._name, mode) OSError: libespeak.so.1: cannot open shared object file: No such file or directory