diff --git a/scripts/start.mjs b/scripts/start.mjs
index ffb303c..561a298 100644
--- a/scripts/start.mjs
+++ b/scripts/start.mjs
@@ -9,19 +9,25 @@ const { addonID } = details.config;
 const { zoteroBinPath, profilePath, dataDir } = cmd.exec;
 
 if (!existsSync(zoteroBinPath)) {
-  throw new Error("Zotero bin do no exist.");
+  throw new Error("Zotero binary does not exist.");
 }
 
 if (existsSync(profilePath)) {
   const addonProxyFilePath = path.join(profilePath, `extensions/${addonID}`);
   const buildPath = path.resolve("build/addon");
 
+  if (!existsSync(path.join(buildPath, "./manifest.json"))) {
+    throw new Error(
+      `The built file does not exist, maybe you need to build the addon first.`,
+    );
+  }
+
   function writeAddonProxyFile() {
     writeFileSync(addonProxyFilePath, buildPath);
     console.log(
-      `[info] Addon proxy file has been updated. \n
-      File path: ${addonProxyFilePath} \n
-      Addon path: ${buildPath} \n`,
+      `[info] Addon proxy file has been updated. 
+      File path: ${addonProxyFilePath} 
+      Addon path: ${buildPath} `,
     );
   }
 
diff --git a/scripts/zotero-cmd-default.json b/scripts/zotero-cmd-default.json
index 9be4de9..c02a99f 100644
--- a/scripts/zotero-cmd-default.json
+++ b/scripts/zotero-cmd-default.json
@@ -8,12 +8,12 @@
     "zoteroBinPath": "/path/to/zotero.exe",
 
     "@comment-profilePath": "Please input the path of the profile used for development in `profilePath`.",
-    "@comment-profilePath-tip": "If this field is kept empty, Zotero will start with the default profile.",
+    "@comment-profilePath-tip": "Start the profile manager by `/path/to/zotero.exe -p` to create a profile for development",
     "@comment-profilePath-see": "https://www.zotero.org/support/kb/profile_directory",
     "profilePath": "/path/to/profile",
 
     "@comment-dataDir": "Please input the directory where the database is located in dataDir",
-    "@comment-dataDir-tip": "If this field is kept empty, Zotero will start with the default date.",
+    "@comment-dataDir-tip": "If this field is kept empty, Zotero will start with the default data.",
     "@comment-dataDir-see": "https://www.zotero.org/support/zotero_data",
     "dataDir": ""
   }