Custom Fields - VM 2.0.0 RC3

[lipi]

If I try to create a new Custom Field, then I get a blank page with the following content:

Parse error: syntax error, unexpected ':' in /var/www/lipix.ciutadella.es/joomla17/plugins/vmcustom/stockable/stockable.php on line 501

The same when I try to create a new product despite it is created.

I dont know what to do!.