Fatal error: Call to undefined method SelectQuery::field()

Same issue. I'm looking at the module, and it seems it's using some outdated interface of SelectQuery object. So far, I've tried to update it this way, but this only changes the error to "Warning: Attempt to assign property of non-object en mostpopular_refresh() (línea 1062 de /var/www/vhosts/mysite/sites/all/modules/mostpopular/mostpopular.module)." BTW, mostpopular.module has only 145 lines...

Still working on it...

+++ /var/www/vhosts/mysite/sites/all/modules/mostpopular/modules/mostpopular_drupal/mostpopular_drupal.module   2012-04-20 11:14:40.593666693 +0200
@@ -63,14 +63,14 @@
 
   // If we are looking at a single day, get the day stats
   if ($span <= 60 * 60 * 24) {
-    $query->field('c', 'daycount', 'count');
+    $query->addField('c', 'daycount', 'count');
     $query
       ->condition('c.daycount', 0, '>')
       ->orderBy('c.daycount', 'DESC');
   }
   // Otherwise, get the overall stats for nodes created since the last run.
   else {
-    $query->field('c', 'totalcount', 'count');
+    $query->addField('c', 'totalcount', 'count');
     $query
       ->condition('n.created', $ts, '>=')
       ->condition('c.totalcount', 0, '>')
@@ -142,4 +142,4 @@
  */
 function mostpopular_drupal_next_run($service, $span, $last_run) {
   return time();

I think I've fixed it. Additionally, mostpopular_drupal_refresh_viewed() was returning an array of arrays, while it should be an array of objects. Here goes the patch.

A new version of the patch, I've just changed the variable name.

You're welcome...
I'm rather new as a contributor to the issue management system of drupal.org, but I think that it won't hurt if I assign the bug to myself and change the status. Yes, for sure that it's written somewhere, but I don't have time right now to read the instructions.

Patch failed at line 42. Also please review the naming conventions for the patches. I'll see if I can manually update this information.

OK, sorry! I've prepared a new patch and this one is well tested.

Thanks for taking care of that. Patch has been applied and pushed to the dev build. Please give it a try (may take 24 hours till build is complete)