diff --git a/Dockerfile b/Dockerfile
index f98cf18..85a9725 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,12 @@
-FROM ubuntu:16.04
+FROM ubuntu:18.04
 
-MAINTAINER Isaac A., <isaac@isaacs.site>
+LABEL       author="Isaac A." maintainer="isaac@isaacs.site"
 
 RUN apt update \
     && apt upgrade -y \
     && apt install -y lib32gcc1 lib32stdc++6 unzip curl iproute2 libgdiplus \
     && curl -sL https://deb.nodesource.com/setup_6.x | bash - \
-    && apt install -y nodejs \
+    && apt install -y nodejs npm \
     && mkdir /node_modules \
     && npm install --prefix / ws \
     && useradd -d /home/container -m container
diff --git a/wrapper.js b/wrapper.js
index 3f61a94..51a4c62 100644
--- a/wrapper.js
+++ b/wrapper.js
@@ -2,7 +2,9 @@
 
 var startupCmd = "";
 const fs = require("fs");
-fs.writeFile("latest.log", "");
+fs.writeFile("latest.log", "", (err) => {
+    if (err) console.log("Callback error in appendFile:"+err);
+});
 
 var args = process.argv.splice(process.execArgv.length + 2);
 for (var i = 0; i < args.length; i++) {
@@ -57,7 +59,9 @@ var poll = function( ) {
                 if (json.Message !== undefined && json.Message.length > 0) {
                     console.log(json.Message);
                     const fs = require("fs");
-                    fs.appendFile("latest.log", "\n" + json.Message);
+                    fs.appendFile("latest.log", "\n" + json.Message, (err) => {
+                        if (err) console.log("Callback error in appendFile:"+err);
+                    });
                 }
             } else {
                 console.log("Error: Invalid JSON received");