2015-12-01 16:55:48 thumbor:ERROR ERROR: Traceback (most recent call last):

 "/usr/local/lib/python2.7/dist-packages/tornado/web.py", line 1401, in _stack_context_handle_exception
raise_exc_info((type, value, traceback))

 "/usr/local/lib/python2.7/dist-packages/tornado/stack_context.py", line 314, in wrapped
ret = fn(_args, *_kwargs)

 "/usr/local/lib/python2.7/dist-packages/tornado/concurrent.py", line 487, in run_callback
callback(future.result())

 "/usr/local/lib/python2.7/dist-packages/thumbor/filters/watermark.py", line 55, in on_fetch_done
self.watermark_engine.load(buffer, self.extension)

 "/usr/local/lib/python2.7/dist-packages/thumbor/engines/__init__.py", line 98, in load
image_or_frames = self.create_image(buffer)

 "/usr/local/lib/python2.7/dist-packages/opencv_engine/engine.py", line 78, in create_image
imagefiledata = cv.CreateMatHeader(1, len(buffer), cv.CV_8UC1)TypeError: object of type 'NoneType' has no len()

Traceback (most recent call last):


 "<string>", line 1, in <module>


 "C:\Users\Viktor\AppData\Local\Temp\pip-9ceji4i6-build\setup.py", line 10, in <module>

import semantic_version

ModuleNotFoundError: No module named 'semantic_version'
