Error since Upgrading Phython to 3.6

I was able to upgrade my Pine64 from Jessie to Raspbian Stretch 9 and Python 3.6 in a virtualenv. Was alot of work but I got it. The only thing is one error in the logs. Does anyone know what this could be?

2017-10-09 06:40:20 ERROR (MainThread) [homeassistant.core] Error doing job: Task exception was never retrieved Traceback (most recent call last): File "/srv/homeassistant/lib/python3.6/site-packages/psutil/", line 461, in virtual_memory avail = mems[b'MemAvailable:'] KeyError: b'MemAvailable:' During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/usr/local/lib/python3.6/asyncio/", line 181, in _step result = coro.throw(exc) File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/helpers/", line 381, in async_process_entity new_entity, self, update_before_add=update_before_add File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/helpers/", line 212, in async_add_entity yield from self.hass.async_add_job(entity.update) File "/usr/local/lib/python3.6/asyncio/", line 331, in __iter__ yield self # This tells Task to wait for completion. File "/usr/local/lib/python3.6/asyncio/", line 244, in _wakeup future.result() File "/usr/local/lib/python3.6/asyncio/", line 244, in result raise self._exception File "/usr/local/lib/python3.6/concurrent/futures/", line 55, in run result = self.fn(*self.args, **self.kwargs) File "/srv/homeassistant/lib/python3.6/site-packages/homeassistant/components/sensor/", line 129, in update self._state = round((psutil.virtual_memory().total - File "/srv/homeassistant/lib/python3.6/site-packages/psutil/", line 2008, in virtual_memory ret = _psplatform.virtual_memory() File "/srv/homeassistant/lib/python3.6/site-packages/psutil/", line 463, in virtual_memory avail = calculate_avail_vmem(mems) File "/srv/homeassistant/lib/python3.6/site-packages/psutil/", line 352, in calculate_avail_vmem f = open_binary('%s/zoneinfo' % get_procfs_path()) File "/srv/homeassistant/lib/python3.6/site-packages/psutil/", line 217, in get_procfs_path return sys.modules['psutil'].PROCFS_PATH AttributeError: module 'psutil' has no attribute 'PROCFS_PATH'