title: how can i fix this error: ParseError at [row,col]:[21,35]
body: <p>Error:</p>
  <p>ParseError at [row,col]:[21,35] Message: <a href="http://www.w3.org/TR/1999/REC-xml-names-19990114#AttributePrefixUnbound?TextView&amp;app:layout_constraintBottom_toBottomOf&amp;app" rel="nofollow noreferrer">http://www.w3.org/TR/1999/REC-xml-names-19990114#AttributePrefixUnbound?TextView&amp;app:layout_constraintBottom_toBottomOf&amp;app</a></p>
  <p>AndroidManifest File:</p>
  <pre><code>&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; /&gt;
  
  &lt;application
      android:allowBackup=&quot;true&quot;
      android:icon=&quot;@mipmap/ic_launcher&quot;
      android:label=&quot;@string/app_name&quot;
      android:roundIcon=&quot;@mipmap/ic_launcher_round&quot;
      android:supportsRtl=&quot;true&quot;
      android:theme=&quot;@style/Theme.SwitchStuff&quot;&gt;
      &lt;activity android:name=&quot;.Login&quot;&gt;
              &lt;category android:name=&quot;android.intent.category.LAUNCHER&quot; /&gt;
      &lt;/activity&gt;
      &lt;activity android:name=&quot;.SignUp&quot; /&gt;
      &lt;activity android:name=&quot;.MainActivity&quot;&gt;
              &lt;action android:name=&quot;android.intent.action.MAIN&quot; /&gt;
      &lt;/activity&gt;
  &lt;/application&gt;
  </code></pre>
  <p>build.gradle File:</p>
  <pre><code>plugins { id 'com.android.application' }
  
  android { compileSdkVersion 30 buildToolsVersion &quot;30.0.3&quot;
  
  defaultConfig {
      applicationId &quot;com.mkrsudios.switchstuff&quot;
      minSdkVersion 16
      targetSdkVersion 30
      versionCode 1
      versionName &quot;1.0&quot;
  
      testInstrumentationRunner &quot;androidx.test.runner.AndroidJUnitRunner&quot;
  }
  
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
      }
  }
  compileOptions {
      sourceCompatibility JavaVersion.VERSION_1_8
      targetCompatibility JavaVersion.VERSION_1_8
  }
  buildFeatures {
      viewBinding true
  }
  }
  
  dependencies {
  
  implementation 'com.github.VishnuSivadasVS:Advanced-HttpURLConnection:1.2'
  
  implementation 'androidx.appcompat:appcompat:1.3.0'
  implementation 'com.google.android.material:material:1.3.0'
  implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
  implementation 'androidx.vectordrawable:vectordrawable:1.1.0'
  implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.3.1'
  implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1'
  implementation 'androidx.navigation:navigation-fragment:2.3.5'
  implementation 'androidx.navigation:navigation-ui:2.3.5'
  implementation 'androidx.annotation:annotation:1.2.0'
  implementation 'com.google.android.gms:play-services-auth:19.0.0'
  implementation 'com.google.android.material:material:1.5.0-alpha01'
  implementation 'androidx.legacy:legacy-support-v4:1.0.0'
  testImplementation 'junit:junit:4.+'
  androidTestImplementation 'androidx.test.ext:junit:1.1.2'
  androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
  }
  </code></pre>
  <p>I do not know where this error may be but through my research is in any of these files</p>