I'm having the same problem described in http://drupal.org/node/1493032, but using 6.x-2.x-dev (drupal 6.24). It is not clear from the discussion whether the fix in http://drupal.org/node/1493032#comment-6345542 was applied to the 6.x version, but a comparison of two lines in includes/libraries.phpqrcode.inc suggests to me that it may not have been:

6.x-2.x-dev, includes/libraries.phpqrcode.inc, line 73:
require_once libraries_get_path('phpqrcode/qrlib.php)';

7.x-2.x-dev, includes/libraries.phpqrcode.inc. line 73:
require_once libraries_get_path('phpqrcode').'/qrlib.php';

I patched that and cleared the cache but still get the error. Are there other files that need to be patched? There are about a dozen things listed in the changelog and it's difficult to tell which changes are relevant to this issue.

For what it's worth, I'm using the node URL block with the "small" mobile codes preset, with provider set to phpqrcode, size and margin both "1," and error correction level "L."

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rclemings’s picture

rclemings CreditAttribution: rclemings commented
Status: Active » Closed (works as designed)

Nevermind; the error resulted from a basic authentication issue.