…have you declared this activity in your AndroidManifest.xml

by

You have declared this activity outside application tag. 

<activity  android:name=".Compte"  android:screenOrientation="portrait" />

Make it like this : 

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.Light.NoTitleBar" >

    <activity
        android:name=".Menu" 
        android:screenOrientation="portrait"
        android:label="@string/app_name">
        <intent-filter>
             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>

    </activity>

    <activity  
         android:name=".Compte"  
         android:screenOrientation="portrait" />

</application>

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

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