我按照本教程设置了一个Python项目，该项目在服务器端使用tesseract和pyocr。 https://www.digitalocean.com/community/tutorials/how-to-serve-flask-applications-with-uwsgi-and-nginx-on-ubuntu-16-04
在跑步时：
uwsgi --socket 0.0.0.0:5000 --protocol=http -w wsgi:app
Tesseract代码可以正常工作，但是在创建systemd单位文件并在nginx代理后面使用它之后。我收到以下错误：
Traceback (most recent call last):
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 2309, in __call__
return self.wsgi_app(environ, start_response)
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "./app/controllers/service.py", line 32, in docPost2
finaldict = handleFiles(fileA, fileB, fileC)
File "./app/controllers/service.py", line 71, in handleFiles
finaldict["fileAdata"] = FileA(fileAPath)
File "./app/controllers/readers/FileA.py", line 6, in Form21
final_text = fileFromTesseract(file_path)
File "./app/controllers/readers/tesseractReader.py", line 18, in fileFromTesseract
image_jpeg = image_pdf.convert('jpeg')
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/wand/image.py", line 3032, in convert
cloned.format = format
File "/root/extraction-app/extraction-app-venv/local/lib/python2.7/site-packages/wand/image.py", line 2932, in format
raise ValueError(repr(fmt) + ' is unsupported format')
ValueError: 'jpeg' is unsupported format
我尝试在Ubuntu16.04计算机上的Google Compute Engine上进行部署。 我尝试使用Python 2.7和Python3.x。还尝试了其他图像格式，例如“ png”和“ jpg”。
他们都没有工作。请帮忙。