Moodle: Javascript errors preventing SCORM package loading?

Question

I'm new here and having some issues on my Moodle site through which I provide online training. We upload SCORM packages to the Moodle and recently have had an issue which is stopping the SCORM packages from loading or sometimes just taking a very long time to load.

We receive the SCORM error that the "SCORM player has determined that your internet connection is unreliable or has been interrupted. If you continue in the SCORM activity, your progress may not be saved. You should exit the activity now and return when you have a dependable connection".

However, we have tried this from a number of different internet points and devices, with the same problem reoccurring. We therefore contacted our hosting provider, who replied:

"It appears the issue is coming from the fact that there are quite a few JavaScript errors on the site. I am pasting them below:

Failed to load resource: net::ERR_FAILED

chrome-extension://dliochdbjfkdbacpmhlcpmleaejidimm/cast_sender.js

Failed to load resource: net::ERR_FAILED

chrome-extension://enhhojjnijigcajfphajepfemndkmdlo/cast_sender.js

Failed to load resource: net::ERR_FAILED

chrome-extension://fmfcbgogabcbclcofgocippekhfcmgfj/cast_sender.js

Failed to load resource: net::ERR_FAILED

chrome-extension://pkedcjkdefgpdelpbcmbmeomcjbeemfm/cast_sender.js

Failed to load resource: net::ERR_FAILED

chrome-extension://fjhoaacokmgbjemoflkofnenfaiekifl/cast_sender.js

Failed to load resource: net::ERR_FAILED 4jquery.js:5 Uncaught

TypeError: Cannot read property 'scrollHeight' of null(anonymous function)

@ jquery.js:5x.extend.access

@ jquery.js:3x.fn.(anonymous function)

@ jquery.js:5e @ content-script.js:1d

@ content-script.js:1(anonymous function)

@ content-script.js:1"

Can anyone assist and help me identify what the problem is that is causing the loading issues with my SCORM packages?

Kind regards

Eddie

Answer 1

I had the same issue with the message SCORM player has determined that your internet connection is unreliable or has been interrupted on all moodle servers, but the server is working fine and the work is saved correctly.

My solutions are two:

1. Set a bigger timeout (by default, moodle check internet connection with a 2 seconds timeout). You can set this parameter in 5, 7 or 10 seconds. You can set this value on lib/yui/src/checknet/js/checknet.js (search the request to a checknet.txt file)

2. Remove the checknet functionality. You can comment two lines on /mod/scorm/player.php. The lines you need to comment are these:

    $PAGE->requires->string_for_js('networkdropped', 'mod_scorm');
    $PAGE->requires->yui_module('moodle-core-checknet', 'M.core.checknet.init', array(array(
        'message' => array('networkdropped', 'mod_scorm'),
    )));
   

This is not a solution for a server that works wrong, this is a solution for a server that works fine but the time of the AJAX response is more than 2 seconds.

Answer 2

I don't believe that the first few (for cast_sender.js) are related to the issue at hand; cast_sender.js is a local script related to Chrome's ability to use Chromecast functionality. (Edit: The Google Cast SDK uses a rather "agricultural" method to detect if you're running Chrome with the appropriate extension; it's a known issue. Google chrome cast sender error if chrome cast extension is not installed or using incognito, https://code.google.com/p/google-cast-sdk/issues/detail?id=309)

The later lines they've pasted seem to bubble up from effectively a null pointer in whatever content_script.js is. Is the SCORM content locally produced? Do you know what software was used to create it - e.g. Articulate or Storyline? I presume that content_script.js is part of the player software?