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我通过m2eclipse向导创建了一个新项目，并选择了空白的liftweb原型。该项目已创建，我向项目中添加了scala特性（我暂时没有安装maven-scala插件）。Maven和Eclipse Lift项目错误
我能够使用目标jetty:run运行项目。不过，我还是有以下错误显示在Eclipse（清洁项目没有做任何事情）：
Description Resource Path Location Type
error while loading Helpers, Scala signature Helpers has wrong version expected: 5.0 found: 4.1 in C:\Users\Ken\.m2\repository\net\liftweb\lift-webkit\0.8\lift-webkit-0.8.jar(net/liftweb/util/Helpers.class) first Unknown Scala Problem
error while loading LiftRules, Scala signature LiftRules has wrong version expected: 5.0 found: 4.1 in C:\Users\Ken\.m2\repository\net\liftweb\lift-webkit\0.8\lift-webkit-0.8.jar(net/liftweb/http/LiftRules.class) first Unknown Scala Problem
error while loading Loc, Scala signature Loc has wrong version expected: 5.0 found: 4.1 in C:\Users\Ken\.m2\repository\net\liftweb\lift-webkit\0.8\lift-webkit-0.8.jar(net/liftweb/sitemap/Loc.class) first Unknown Scala Problem
error while loading MainGenericRunner, Scala signature MainGenericRunner has wrong version expected: 5.0 found: 4.1 in C:\Users\Ken\.m2\repository\org\scala-lang\scala-compiler\2.7.1\scala-compiler-2.7.1.jar(scala/tools/nsc/MainGenericRunner.class) first Unknown Scala Problem
error while loading Menu, Scala signature Menu has wrong version expected: 5.0 found: 4.1 in C:\Users\Ken\.m2\repository\net\liftweb\lift-webkit\0.8\lift-webkit-0.8.jar(net/liftweb/sitemap/Menu.class) first Unknown Scala Problem
Plugin execution not covered by lifecycle configuration: org.scala-tools:maven-scala-plugin:2.15.2:compile (execution: default, phase: compile) pom.xml /first line 76 Maven Project Build Lifecycle Mapping Problem
Plugin execution not covered by lifecycle configuration: org.scala-tools:maven-scala-plugin:2.15.2:testCompile (execution: default, phase: test-compile) pom.xml /first line 76 Maven Project Build Lifecycle Mapping Problem
这里是错误的截图（可以更容易阅读，点击全尺寸图像）：
是否有人知道这里发生了什么？有什么建议么？
其他信息：
以下警告拿出当我运行该项目：
[WARNING]
[WARNING] Some problems were encountered while building the effective model for com.kpthunder.lift:first:war:0.0.1-SNAPSHOT
[WARNING] 'build.plugins.plugin.version' for org.mortbay.jetty:maven-jetty-plugin is missing. @ line 87, column 15
[WARNING] 'build.plugins.plugin.version' for net.sf.alchim:yuicompressor-maven-plugin is missing. @ line 95, column 15
[WARNING] 'build.plugins.plugin.version' for org.scala-tools:maven-scala-plugin is missing. @ line 72, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-eclipse-plugin is missing. @ line 109, column 15
[WARNING] 'reporting.plugins.plugin.version' for org.scala-tools:maven-scala-plugin is missing. @ line 133, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
[WARNING]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!