Code that is trying illustrate my LinkageError

Controller.scala

def dashboard = Action {
    val user = User.findByUsername("aczerwonka")
    val prefs = UserPreferences.findByUsername("aczerwonka")
    val config = Configuration.get();
    Ok(views.html.dashboard(user, prefs, config))
  }

dashboard.scala.html

@(user: User, prefs: UserPreferences, config: Configuration)

@scripts = {
    <script src="@routes.Assets.at("javascripts/spin.min.js")" type="text/javascript"></script>
    <script src="@routes.Assets.at("javascripts/highcharts/highcharts.js")" type="text/javascript"></script>
    <script src="@routes.Assets.at("javascripts/dashboard.js")" type="text/javascript"></script>
}

@mainmenu(user, prefs, config, scripts) {

    <div class="container-fluid">
      <div class="row-fluid">
         <div class="span12">
          <p><h2>@prefs.productionTitle(config) <small>@prefs.productionSubtitle(config)</small></h2></p>
          <div class="row-fluid">
          <div id="productionDecline" class="span6"></div>
          <div id="productionArea" class="span3"></div>
          <div class="span3">
            <div class="well">
            <table class="table table-condensed">
              <thead>
                <th colspan="2">Operational Metrics</th>
              </thead>
              
              <tbody>
                <tr>
                  <td>Total Reserves</td>
                  <td>55,125,400 BOE</td>
                </tr>
                <tr>
                  <td>Average OPEX</td>
                  <td>$5,125,400 USD/d</td>
                </tr>
                <tr>
                  <td>F&D Cost</td>
                  <td>$215,500 USD</td>
                </tr>
              </tbody>
            </table>
          </div>
          <div class="well">
            <table class="table table-condensed">
              <thead>
                <th colspan="2">Economic Metrics</th>
              </thead>
              <tbody>
                <tr>
                  <td>IRR</td>
                  <td>17.09%</td>
                </tr>
                <tr>
                  <td>NPV (10%)</td>
                  <td>$268,675,250 USD</td>
                </tr>
              </tbody>
            </table>
          </div>
        </div>
        </div>
      </div>
    </div>
    </div>

}

UserPreferences.scala

case class UserPreferences(
  id: ObjectId = new ObjectId,
  username: String,
  program: String,
  production: Option[ProductionQuery]) {
  
  def productionTitle(config: Configuration): String = {
    config.production.types.filter(_.key == production.get.typ).head.name
  }
  
  def productionSubtitle(config: Configuration): String = {
    val group = config.production.groupOptions.filter(_.value == production.get.groupBy).head.label
    production.get.definition + " by " + group + " (" + production.get.unit + ")"
  }
  
}

Note that the UserPreferences case class is persisted to mongodb via Scalat. The error seems to indicate a classloader issue, so I'm wondering if it's an SBT issue.