Android – Error 350 with layout_height (Android Studio)

I am getting this error when i try to build my application:

error: '350' is incompatible with attribute android:layout_height (attr) dimension|enum [fill_parent=4294967295, match_parent=4294967295, wrap_content=4294967294].
Message{kind=ERROR, text=error: '350' is incompatible with attribute android:layout_height (attr) dimension|enum [fill_parent=4294967295, match_parent=4294967295, wrap_content=4294967294]., sources=[C:\Users\chris\Documents\GitHub\IFB398\MiBaseApplication\app\src\main\res\layout\activity_login_screen.xml:30], original message=, tool name=Optional.of(AAPT)}

I am using Android studio and I am really new to all this.

EDIT 1:

<EditText
        android:id="@+id/UsernameEditText"
        android:layout_width="307dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:ems="10"
        android:hint="Username"
        android:inputType="textPersonName"
        android:textColor="@android:color/background_light"
        android:textColorHint="@android:color/darker_gray"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.513"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.55" />

    <ImageView
        android:id="@+id/LogoImageView"
        android:layout_width="350"
        android:layout_height="350"
        android:layout_marginBottom="6dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:srcCompat="@mipmap/mibaselogo" />

    <EditText
        android:id="@+id/PasswordEditText"
        android:layout_width="309dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:ems="10"
        android:hint="Password"
        android:inputType="textPassword"
        android:textColor="@android:color/background_light"
        android:textColorHint="@android:color/darker_gray"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.514"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/UsernameEditText"
        app:layout_constraintVertical_bias="0.085" />

I have not added all code. Just the section above and below the error. (I am assuming that the error was on line 30 which is the start of the image.