diff --git a/build.gradle.kts b/build.gradle.kts
index be575d1..8af4226 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -17,6 +17,7 @@ plugins {
     id("java")
     id("application")
     id("idea")
+    id("maven-publish")
     id("org.jetbrains.kotlin.jvm") version "1.3.72"
     id("org.jetbrains.dokka") version "1.4.0-rc"
 }
@@ -90,6 +91,25 @@ task("fatJar", Jar::class) {
     }
     archiveBaseName.set(jarName)
     from(configurations.runtimeClasspath.get()
-            .map {if(it.isDirectory) it else zipTree(it)})
+        .map {if(it.isDirectory) it else zipTree(it)})
     with(tasks.jar.get())
-}
\ No newline at end of file
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("mavenJava") {
+            artifactId = "modpacktools"
+            artifact(tasks.getByName("fatJar"))
+        }
+    }
+
+    repositories {
+        maven {
+            url = uri("https://data.tilera.xyz/maven/")
+            credentials {
+                username = findProperty("mvnUsername") as String?
+                password = findProperty("mvnPassword") as String?
+            }
+        }
+    }
+}
diff --git a/src/main/kotlin/ley/anvil/modpacktools/Main.kt b/src/main/kotlin/ley/anvil/modpacktools/Main.kt
index 1367a54..292f04a 100644
--- a/src/main/kotlin/ley/anvil/modpacktools/Main.kt
+++ b/src/main/kotlin/ley/anvil/modpacktools/Main.kt
@@ -83,12 +83,12 @@ fun runCommand(args: Array<out String>) {
                     else
                         errorColor
                 )
-        } catch(e: NoSuchElementException) {
+        } catch(_: NoSuchElementException) {
             fPrintln("Command ${args[0]} not found", *errorColor)
             println(helpMessage)
-        } catch(e: CommandLoader.ConfigMissingException) {
+        } catch(_: CommandLoader.ConfigMissingException) {
             fPrintln("Config is needed for this command yet it is not present. Run 'init' to generate", *errorColor)
-        } catch(e: CommandLoader.ModpackJsonMissingException) {
+        } catch(_: CommandLoader.ModpackJsonMissingException) {
             fPrintln("Modpackjson is needed for this command yet it is not present.", *errorColor)
         } catch(e: MissingConfigValueException) {
             fPrintln("The Config value ${e.missingValue} was expected but was not found", *errorColor)
diff --git a/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt b/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt
index 6b2775e..3d1981c 100644
--- a/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt
+++ b/src/main/kotlin/ley/anvil/modpacktools/util/Util.kt
@@ -36,6 +36,8 @@ import kotlin.reflect.jvm.isAccessible
  * @return the file content as JsonObject
  */
 fun File.readAsJson(): JsonObject {
+    require(this.exists()) {"File to read doesn't exist"}
+
     val reader = FileReader(this)
     val out = JsonParser.parseReader(reader) as JsonObject
     reader.close()
@@ -89,8 +91,8 @@ fun URL.httpPostStr(payload: String, contentType: String, additionalHeaders: Map
  * @return the sanitized URL
  */
 
-fun URL.sanitize(): URL? {
-    return try {
+fun URL.sanitize(): URL? =
+    try {
         URI(this.protocol,
             this.userInfo,
             this.host,
@@ -101,7 +103,6 @@ fun URL.sanitize(): URL? {
     } catch(e: Exception) {
         null
     }
-}
 
 /**
  * gets a function from the receiver and makes it accessible
@@ -127,6 +128,8 @@ infix fun File.mergeTo(other: File): File = File(this.path, other.name)
  * @param zStream the zip stream to write to
  */
 fun Path.toZip(zStream: ZipOutputStream) {
+    require(this.toFile().exists()) {"File must exist"}
+
     Files.walkFileTree(this, object : SimpleFileVisitor<Path>() {
         override fun visitFile(file: Path, attrs: BasicFileAttributes?): FileVisitResult {
             zStream.putNextEntry(ZipEntry(this@toZip.relativize(file).toString()))
@@ -152,6 +155,8 @@ fun File.toZip(zStream: ZipOutputStream) = this.toPath().toZip(zStream)
  * @param outputDir the dir to unzip to
  */
 fun File.unzip(outputDir: File) {
+    require(this.exists()) {"File must exist"}
+
     val stream = ZipInputStream(FileInputStream(this))
     while(true) {
         val entry = stream.nextEntry ?: break