Puppet users - May 2014 - What is wrong with this? Could not match ${variablehere}

So I am just trying to create a file based off a template. I've done this 
many times but am stumped. Maybe some silly syntax error I'm not seeing?

I define the variable:

  $local_server_root = 'E:\LocalServer'

Then use it in the file type:

  file { 'LocalServer_conf':
    ensure    => file,
    path     => "${local_server_root}\\LocalServer.conf",
    content    => template('local_server/LocalServer.conf.erb'),
    require    => Package['local_server'],
    notify    => Service['local_server'],
  }


But I am still getting this error?! Any help is appreciated.

err: Could not retrieve catalog from remote server: Error 400 on SERVER: 
Could not match ${local_server_root}\\LocalServer.conf", at 
/etc/puppetlabs/puppet/environments/test/modules/local_server/manifests/init.pp:45
on node node.local

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