diff --git a/.classpath b/.classpath
index ac3eea8..0baf28c 100644
--- a/.classpath
+++ b/.classpath
@@ -1,9 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="src" path="resources"/>
-	<classpathentry kind="lib" path="D:/Dropbox/Pandacube/Dev/spigot-1.14.3.jar"/>
 	<classpathentry kind="lib" path="lib"/>
+	<classpathentry kind="lib" path="C:/Users/Marc/.m2/repository/com/destroystokyo/paper/paper/1.16.3-R0.1-SNAPSHOT/paper-1.16.3-R0.1-SNAPSHOT.jar"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jdk-13.0.2"/>
 	<classpathentry kind="output" path="bin"/>
 </classpath>
diff --git a/.settings/org.eclipse.jdt.core.prefs b/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000..cd8d089
--- /dev/null
+++ b/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,15 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.methodParameters=do not generate
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=11
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=disabled
+org.eclipse.jdt.core.compiler.source=11
diff --git a/resources/plugin.yml b/resources/plugin.yml
index 88a5136..0bb56d7 100644
--- a/resources/plugin.yml
+++ b/resources/plugin.yml
@@ -2,7 +2,7 @@ name: DiscoSheep
 main: me.cwang.discosheep.DiscoSheep
 authors: [Gibstick, RangerMauve]
 version: 2.0
-api-version: 1.14
+api-version: 1.16
 commands:
   ds:
     description: "Main DiscoSheep command"
diff --git a/src/me/cwang/discosheep/DiscoSheep.java b/src/me/cwang/discosheep/DiscoSheep.java
index 5e4bd81..dd60857 100644
--- a/src/me/cwang/discosheep/DiscoSheep.java
+++ b/src/me/cwang/discosheep/DiscoSheep.java
@@ -41,7 +41,6 @@ public final class DiscoSheep extends JavaPlugin {
             EntityType.MAGMA_CUBE,
             EntityType.MUSHROOM_COW,
             EntityType.OCELOT,
-            EntityType.PIG_ZOMBIE,
             EntityType.RABBIT,
             EntityType.SKELETON,
             EntityType.SLIME,
diff --git a/src/me/cwang/discosheep/PartyBuilder.java b/src/me/cwang/discosheep/PartyBuilder.java
index e48fb74..c45015d 100644
--- a/src/me/cwang/discosheep/PartyBuilder.java
+++ b/src/me/cwang/discosheep/PartyBuilder.java
@@ -50,7 +50,7 @@ public class PartyBuilder {
     }
 
     public PartyBuilder period(int period) throws IllegalArgumentException {
-        if (period < 0 || period > AbstractParty.maxPeriod) {
+        if (period <= 0 || period > AbstractParty.maxPeriod) {
             throw new IllegalArgumentException("invalid period");
         }
         this.period = period;