Deprecated print_error() usage

[volodymyrdovhan]

Hello,
Plugin uses deprecated print_error() function. In newer Moodle versions this legacy API is removed, so this can become an undefined function runtime failure.

Documentation:

• https://moodledev.io/general/community/plugincontribution/checklist#api

Code excerpts:

• File: view.php

15:     $cm         = get_coursemodule_from_instance('hlsplayer', $hlsplayer->id, $course->id, false, MUST_EXIST);
16: } else {
17:     print_error('missingidandn');
18: }