Summary of the issue

The warning pops up on the creation of csv, Basically i am reading the PDF for the extraction of text. I extract text and write it to the CSV, Its not generating any error, Its warning

The exact warning(s) is

Nov 08, 2017 10:48:48 AM org.apache.pdfbox.pdmodel.font.PDSimpleFont toUnicode
WARNING: No Unicode mapping for .notdef (9) in font Helvetica

Environment

Python version : Python 2.7.13

Java version :

openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-8u131-b11-2ubuntu1.17.04.3-b11)
OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)

Java : java -h is working fine.

Os : Ubuntu 17.04

What did you intend to be?

The warning should not pops up. The rest of the goal is achieved

该提问来源于开源项目：chezou/tabula-py