Error while creating a document

[baracaio]

I'm facing a problem while testing the library to integrate it to my project.

The following GIST contains the cURL verbose content and the code I'm using.
All the code is based on the sample included.

https://gist.github.com/baracaio/8e225f1612de1bbcf06a2a588fb7689d

EDIT
Here's the stack trace thrown from the application

PHP Fatal error: Uncaught Clicksign\ClicksignException: Expected status [200], actual status [500], URL [/documents] in /var/www/test/vendor/clicksign/clicksign-php/src/Clicksign/ClientBase.php:136
Stack trace:
#0 /var/www/test/vendor/clicksign/clicksign-php/src/Clicksign/ClientBase.php(94): Clicksign\ClientBase->parseResponse('/documents', 'HTTP/1.1 100 Co...', 200)
#1 /var/www/test/vendor/clicksign/clicksign-php/src/Clicksign/Services/Documents.php(71): Clicksign\ClientBase->request('/documents', 'POST', Array, 200, 'multipart/mixed...')
#2 /var/www/test/vendor/clicksign/clicksign-php/src/Clicksign/Services/Documents.php(36): Clicksign\Services\Documents->_upload('./2018-04-17-11...')
#3 /var/www/test/index.php(19): Clicksign\Services\Documents->upload('./2018-04-17-11...')
#4 {main}
thrown in /var/www/test/vendor/clicksign/clicksign-php/src/Clicksign/ClientBase.php on line 136

[mbbernstein]

@baracaio, por favor envie um email para suporte@clicksign.com com os dados da sua conta para verificarmos nos logs o que está ocorrendo.