Warning: failed to read path from javaldx

An error occurs when converting a file using Libreoffice on ubuntu:

CompletedProcess(args=['soffice', '--headless', '--convert-to', 'txt:Text', '/var/www/Project/temp/e4bac2c2e7c04eb79cfa522967a30dd3.docx', '--outdir', '/var/www/Project/temp/'], returncode=77, stdout=b'', stderr=b'javaldx failed!\nWarning: failed to read path from javaldx\n')

Using subprocess:

process = subprocess.run(['soffice', '--headless', '--convert-to', 'txt:Text', path_docx, '--outdir', settings.TEMP_ROOT], stdout=subprocess.PIPE, stderr=subprocess.PIPE, timeout=timeout)

~# java --version

openjdk 11.0.6 2020-01-14OpenJDK Runtime Environment (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1)OpenJDK 64-Bit Server VM (build 11.0.6+10-post-Ubuntu-1ubuntu118.04.1, mixed mode, sharing)