Possible fix for not_if block throwing undefined method exists? for Chef::Resource::File:Class

Was receiving this error, seemingly having to do with conflicting namespaces (?)

    [2013-05-13T21:59:55+02:00] FATAL: NoMethodError: execute[nodejs make install] (nodejs::install_from_source line 63) had an error: NoMethodError: undefined method `exists?' for Chef::Resource::File:Class

Not sure it's the best way to fix this, but it worked for me.