Now before anyone asks, yes I just downloaded the latest version of BuildTools.jar. Tonight I wanted to start fresh and had BuildTools rebuild Spigot.jar. But I keep getting this error. What does it mean? I used the commandline code in Git Bash Code (Text): Java -jar BuildTools.jar Code (Text): Results : Tests run: 5358, Failures: 0, Errors: 0, Skipped: 0 [INFO] [INFO] --- maven-jar-plugin:2.5:jar (default-jar) @ craftbukkit --- [INFO] Building jar: C:\Users\josh\Desktop\BukkitDownloads\CraftBukkit\target\craftbukkit-1.8.3-R0.1-SNAPSHOT.jar [INFO] [INFO] --- maven-shade-plugin:2.3:shade (default) @ craftbukkit --- [INFO] Including org.bukkit:bukkit:jar:1.8.3-R0.1-SNAPSHOT in the shaded jar. [INFO] Including commons-lang:commons-lang:jar:2.6 in the shaded jar. [INFO] Including com.googlecode.json-simple:json-simple:jar:1.1.1 in the shaded jar. [INFO] Including com.google.guava:guava:jar:17.0 in the shaded jar. [INFO] Including com.google.code.gson:gson:jar:2.2.4 in the shaded jar. [INFO] Including org.avaje:ebean:jar:2.8.1 in the shaded jar. [INFO] Including javax.persistence:persistence-api:jar:1.0 in the shaded jar. [INFO] Including org.yaml:snakeyaml:jar:1.14 in the shaded jar. [INFO] Including org.spigotmc:minecraft-server:jar:1.8.3-SNAPSHOT in the shaded jar. [INFO] Including net.sf.jopt-simple:jopt-simple:jar:3.2 in the shaded jar. [INFO] Including jline:jline:jar:2.12 in the shaded jar. [INFO] Including org.xerial:sqlite-jdbc:jar:3.7.2 in the shaded jar. [INFO] Including mysql:mysql-connector-java:jar:5.1.14 in the shaded jar. [WARNING] craftbukkit-1.8.3-R0.1-SNAPSHOT.jar, minecraft-server-1.8.3-SNAPSHOT.jar define 497 overlappping classes: [WARNING] - org.apache.logging.log4j.core.appender.ConsoleAppender$ConsoleManagerFactory [WARNING] - net.minecraft.server.DispenserRegistry$2 [WARNING] - net.minecraft.server.DispenserRegistry$12 [WARNING] - net.minecraft.server.PathfinderGoalNearestAttackableTargetInsentient [WARNING] - net.minecraft.server.PathfinderGoalHurtByTarget [WARNING] - net.minecraft.server.Entity$4 [WARNING] - net.minecraft.server.BlockGrass [WARNING] - net.minecraft.server.Chunk$1 [WARNING] - net.minecraft.server.EntityHuman [WARNING] - net.minecraft.server.BlockPressurePlateBinary$EnumMobType [WARNING] - 487 more... [WARNING] minecraft-server-1.8.3-SNAPSHOT.jar, gson-2.2.4.jar define 153 overlappping classes: [WARNING] - com.google.gson.internal.bind.JsonTreeWriter [WARNING] - com.google.gson.internal.Excluder [WARNING] - com.google.gson.JsonDeserializationContext [WARNING] - com.google.gson.internal.$Gson$Types [WARNING] - com.google.gson.internal.LinkedTreeMap$KeySet [WARNING] - com.google.gson.FieldNamingPolicy$5 [WARNING] - com.google.gson.internal.bind.SqlDateTypeAdapter$1 [WARNING] - com.google.gson.internal.UnsafeAllocator$2 [WARNING] - com.google.gson.FieldAttributes [WARNING] - com.google.gson.internal.$Gson$Types$ParameterizedTypeImpl [WARNING] - 143 more... [WARNING] guava-17.0.jar, minecraft-server-1.8.3-SNAPSHOT.jar define 1686 overlappping classes: [WARNING] - com.google.common.collect.ImmutableMapValues$1 [WARNING] - com.google.common.io.LineProcessor [WARNING] - com.google.common.util.concurrent.AbstractService$5 [WARNING] - com.google.common.io.BaseEncoding$StandardBaseEncoding$2 [WARNING] - com.google.common.io.ByteProcessor [WARNING] - com.google.common.math.package-info [WARNING] - com.google.common.util.concurrent.SimpleTimeLimiter [WARNING] - com.google.common.io.GwtWorkarounds$5 [WARNING] - com.google.common.cache.AbstractCache$StatsCounter [WARNING] - com.google.common.util.concurrent.CycleDetectingLockFactory$Policies [WARNING] - 1676 more... [WARNING] maven-shade-plugin has detected that some .class files [WARNING] are present in two or more JARs. When this happens, only [WARNING] one single version of the class is copied in the uberjar. [WARNING] Usually this is not harmful and you can skeep these [WARNING] warnings, otherwise try to manually exclude artifacts [WARNING] based on mvn dependency:tree -Ddetail=true and the above [WARNING] output [WARNING] See http://docs.codehaus.org/display/MAVENUSER/Shade+Plugin [INFO] Replacing original artifact with shaded artifact. [INFO] Replacing C:\Users\josh\Desktop\BukkitDownloads\CraftBukkit\target\craftbukkit-1.8.3-R0.1-SNAPSHOT.jar with C:\Users\josh\Desktop\BukkitDownloads\CraftBukkit\target\craftbukkit-1.8.3-R0.1-SNAPSHOT-shaded.jar [INFO] Dependency-reduced POM written at: C:\Users\josh\Desktop\BukkitDownloads\CraftBukkit\dependency-reduced-pom.xml [INFO] Dependency-reduced POM written at: C:\Users\josh\Desktop\BukkitDownloads\CraftBukkit\dependency-reduced-pom.xml [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 24.560 s [INFO] Finished at: 2015-05-18T01:26:49-04:00 [INFO] Final Memory: 25M/473M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:2.3:shade (default) on project craftbukkit: Error creating shaded jar: C:\Users\josh\Desktop\BukkitDownloads\CraftBukkit\dependency-reduced-pom.xml (Access is denied) -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException Exception in thread "main" java.lang.RuntimeException: Error running command, return status !=0: [sh, C:\Users\josh\Desktop\BukkitDownloads\apache-maven-3.2.3/bin/mvn, clean, install] at org.spigotmc.builder.Builder.runProcess(Builder.java:492) at org.spigotmc.builder.Builder.main(Builder.java:384)