无法使用 tabula-py 读取 pdf

如何解决无法使用 tabula-py 读取 pdf

我正在尝试使用 tabula-py 解析 pdf，但我不断收到此错误堆栈 -

CalledProcessError(1,['java','-Dfile.encoding=UTF8','-jar','/home/ubuntu/.local/share/virtualenvs/my-project-9AYKFKDB/lib/python3.6/site-packages/tabula/tabula-1.0.4-jar-with-dependencies.jar','--pages','all','--lattic

这是代码-

 import tabula
    @app.route('/test',methods=['GET'])
    def test():
        df = tabula.read_pdf("file.pdf")

当我尝试通过命令行解析 pdf 时，它可以工作

java -jar /home/ubuntu/.local/share/virtualenvs/my-project-9AYKFKDB/lib/python3.6/site-packages/tabula/tabula-1.0.4-jar-with-dependencies.jar --pages 1 /home/ubuntu/my-project/file.pdf 

我的Pipfile看起来像这样

[[source]]
name = "pypi"
url = "https://pypi.org/simple"
verify_ssl = true

[dev-packages]

[packages]
flask = "*"
tabula-py = "*"

[requires]
python_version = "3.6"

请问可能是什么问题？