View settings error: Only variables should be passed by reference en theme_weight_view_weight()

When I set the "Format" of a view to "Weight Changer" and save the view I receive this error:

Strict warning: Only variables should be passed by reference en theme_weight_view_weight() (línea 214 de D:\xampp\htdocs\drupal2\sites\all\modules\weight\weight.views.inc).

I receive the same error when I open the "view page".

When I reorder the items in the view page and save I receive this error:

Notice: Undefined index: weight in weight_view_weight_form_submit() (line 269 of D:\xampp\htdocs\drupal3\sites\all\modules\weight\weight.views.inc).

I don't know if the last error is related to the bug, if it isn't I'll report it in another issue after this one gets fixed.