problems with QVariantMap("No source available for "QBasicAtomicInt_fetchAndAddOrdered()")

Question

I am getting this error (colored in red):

"No source available for "QBasicAtomicInt_fetchAndAddOrdered() at 0xba49e3f0" - when I try to execute following line in debug mode:

item.mediaUrl = results.value("itemMediaUrl").toString();

where results is a QVariantMap (I manage to successfully read other values from results, e.g., other strings, ints, etc.) and item is just an object which has a variable of type QString, mediaUrl.

Any help?? Any suggestions?? Thanks

ps. It seems I fixed it in this way:

QUrl url =  results.value("itemMediaUrl").toUrl();
    item.mediaUrl = url.toString();

I think if you put the two lines in one (i.e., directly apply toString() after toUrl... it may still not work...