'ascii' codec can't encode character

I tried to convert some tables in Polish govt doc, containing polish accented characters.
This failed with error: `UnicodeEncodeError: 'ascii' codec can't encode character u'\u015a' in position 346: ordinal not in range(128)`
The character in question is `ś`, but there are way more such characters in that file.

If I need something reconfigured to be able to parse such chars, I believe it shouldn't raise an error, but rather suggest change :)

I can share the file if needed :)

Start by reproducing the conversion with a PDF table containing Polish characters such as ś; the issue does not name a source file or test. Done means the table can be converted without the reported UnicodeEncodeError, or the application clearly suggests the required configuration.

Written by the indexing model from the issue text.