What is the compile error here?

compile.log

 overloaded method value build with alternatives:
[error]   [K1 <: java.lang.Object, V1 <: java.lang.Object]()com.google.common.cache.Cache[K1,V1] <and>
[error]   [K1 <: java.lang.Object, V1 <: java.lang.Object](x$1: com.google.common.cache.CacheLoader[_ >: K1, V1])com.google.common.cache.LoadingCache[K1,V1]
[error]  cannot be applied to (com.google.common.cache.CacheLoader[String,Long])
[error]     .build(
[error]      ^
[error] one error found

QueueMetaCache.scala

import java.util.concurrent.TimeUnit
import com.google.common.cache.{LoadingCache, CacheLoader, CacheBuilder}

/**
 * using google guave instead of building our own like in the previous case.
 */
class QueueMetaCache extends ConfigSupport {

  private val queueRefreshCache :LoadingCache[String, Long]= CacheBuilder.newBuilder()
    .maximumSize(10000)
    .expireAfterWrite(config.findInteger("refresh.cache.expiry.minute", 5), TimeUnit.MINUTES)
    .build(
    new CacheLoader[String, Long] {
      def load(key: String) = QueueMetaStore.getResurfaceTime(key)
    }
  )

  def refreshTime(queueName: String) = {
    queueRefreshCache.get(queueName)
  }
}

The issue stems from the use of Long. If you use java.lang.Long the code will work. A more detailed explanation can be found there: http://stackoverflow.com/questions/16196290/scala-2-10-type-mismatch-using-google-guavas-cachebuilder