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A PHP Error was encountered

Severity: Notice

Message: Undefined index: userid

Filename: views/question.php

Line Number: 191

Backtrace:

File: /var/www/html/cnasolution/application/views/question.php
Line: 191
Function: _error_handler

File: /var/www/html/cnasolution/application/controllers/Questions.php
Line: 419
Function: view

File: /var/www/html/cnasolution/index.php
Line: 315
Function: require_once

I want to display a .txt or .docx or .pdf from local storage in my flutter application without using any third-party or pre-installed application. Is there any way or library to implement UI which will allow me to show such files? I have used 'open_file' library but it uses the third party app. Please help, Thanks in advance!.

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