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在https://predictionio.incubator.apache.org/templates/recommendation/quickstart/之后，我没有构建模板/引擎（我试图构建MyRecommendation和另一个NLP模板），但是在快速入门（用于0.11.1构建）之后。 pio build --verbose结束与：预测IO：构建，没有发现引擎
[INFO] [Engine$] Compilation finished successfully.
[INFO] [Engine$] Looking for an engine...
[ERROR] [Engine$] No engine found. Your build might have failed. Aborting.
当我尝试运行pio train它失败：
Exception in thread "main" scala.ScalaReflectionException: object org.example.recommendation.RecommendationEngine not found.
侦听器确定运行（数据也可以通过卷曲拉），pio status：
[INFO] [Management$] Inspecting PredictionIO...
[INFO] [Management$] PredictionIO 0.11.1-SNAPSHOT is installed at /home/us/proj/incubator-predictionio/PredictionIO-0.11.1-SNAPSHOT
[INFO] [Management$] Inspecting Apache Spark...
[INFO] [Management$] Apache Spark is installed at /home/us/proj/incubator-predictionio/PredictionIO-0.11.1-SNAPSHOT/vendors/spark-2.1.1-bin-hadoop2.6
[INFO] [Management$] Apache Spark 2.1.1 detected (meets minimum requirement of 1.3.0)
[INFO] [Management$] Inspecting storage backend connections...
[INFO] [Storage$] Verifying Meta Data Backend (Source: PGSQL)...
[INFO] [Storage$] Verifying Model Data Backend (Source: PGSQL)...
[INFO] [Storage$] Verifying Event Data Backend (Source: PGSQL)...
[INFO] [Storage$] Test writing to Event Store (App Id 0)...
[INFO] [Management$] Your system is all ready to go.
任何想法？