diff --git a/doric-cli/src/actions.ts b/doric-cli/src/actions.ts
index 3f17af66..9df3ac12 100644
--- a/doric-cli/src/actions.ts
+++ b/doric-cli/src/actions.ts
@@ -29,9 +29,12 @@ async function doMerge(jsFile: string) {
 
 
 export async function mergeMap(mapFile: string) {
-    const mergedMap = createMergedSourceMapFromFiles([
-        mapFile.replace(/bundle\//, 'build/'),
-        mapFile,
-    ], true);
-    await fs.promises.writeFile(mapFile, mergedMap);
+    const buildMap = mapFile.replace(/bundle\//, 'build/')
+    if (fs.existsSync(buildMap)) {
+        const mergedMap = createMergedSourceMapFromFiles([
+            buildMap,
+            mapFile,
+        ], true);
+        await fs.promises.writeFile(mapFile, mergedMap);
+    }
 }
\ No newline at end of file
diff --git a/doric-cli/src/dev.ts b/doric-cli/src/dev.ts
index 8385c65f..371db129 100644
--- a/doric-cli/src/dev.ts
+++ b/doric-cli/src/dev.ts
@@ -83,7 +83,10 @@ export default async function dev() {
         return;
       }
       try {
-        const sourceMap = mergeMap(`${jsFile}.map`);
+        const sourceMap = `${jsFile}.map`
+        if (fs.existsSync(sourceMap)) {
+          mergeMap(sourceMap);
+        }
         server.connections.forEach((e: any) => {
           e.sendText(
             JSON.stringify({
diff --git a/doric-cli/src/server.ts b/doric-cli/src/server.ts
index 83616d42..fe768c73 100644
--- a/doric-cli/src/server.ts
+++ b/doric-cli/src/server.ts
@@ -8,19 +8,20 @@ export async function createServer() {
     let contextId: string = "0"
     let clientConnection: any = null
     let debuggerConnection: any = null
+    let deviceId = 0
     const server = (ws as any).createServer((connection: any) => {
+        let thisDeviceId = deviceId++
         console.log('Connected', connection.headers.host)
         if (connection.headers.host.startsWith("localhost")) {
-            console.log(`Debugger ${connection.key} attached to dev kit`.green)
+            console.log(`Debugger ${thisDeviceId} attached to dev kit`.green)
             debuggerConnection = connection
             clientConnection.sendText(JSON.stringify({
                 cmd: 'SWITCH_TO_DEBUG',
                 contextId: contextId
             }), () => { })
         } else {
-            console.log(`Client ${connection.key} attached to dev kit`.green)
+            console.log(`Client ${thisDeviceId} attached to dev kit`.green)
         }
-
         connection.on('text', function (result: string) {
             let resultObject = JSON.parse(result)
             switch (resultObject.cmd) {
@@ -49,12 +50,19 @@ export async function createServer() {
                     console.log(resultObject.data.exception.red);
                     break;
                 case 'LOG':
+                    const date = new Date
+                    const format = function (num: number) {
+                        return (Array(2).join("0") + num).slice(-2);
+                    };
+                    const timeStr = `${format(date.getHours())}:${format(date.getMinutes())}:${format(date.getSeconds())}.${(Array(3).join("0") + date.getMilliseconds()).slice(-3)}`
+                    let logContent = resultObject.data.message as string
+
                     if (resultObject.data.type == 'DEFAULT') {
-                        console.log(`>>>>>>${(resultObject.data.message as string).green}>>>>>>`);
+                        console.log(`${timeStr} Device ${thisDeviceId} ${"[I]".green} ${logContent.green}`.bgBlue);
                     } else if (resultObject.data.type == 'ERROR') {
-                        console.log(`>>>>>>${(resultObject.data.message as string).red}>>>>>>`);
+                        console.log(`${timeStr} Device ${thisDeviceId} ${"[E]".green} ${logContent.green}`.bgRed);
                     } else if (resultObject.data.type == 'WARN') {
-                        console.log(`>>>>>>${(resultObject.data.message as string).yellow}>>>>>>`);
+                        console.log(`${timeStr.black} ${("Device " + thisDeviceId).black} ${"[W]".green} ${logContent.green}`.bgYellow);
                     }
                     break
             }
diff --git a/doric-demo/src/Counter.ts b/doric-demo/src/Counter.ts
index 7bcb2361..33ea75f1 100644
--- a/doric-demo/src/Counter.ts
+++ b/doric-demo/src/Counter.ts
@@ -41,6 +41,9 @@ class CounterVM extends ViewModel<CountModel, CounterView> {
     }
     onBind(s: CountModel, vh: CounterView) {
         vh.number.text = `${s.count}`
+        log("onBind\nseee")
+        logw("onBind")
+        loge("onBind")
     }
 }