sample

<Text View
    android:text="Hapy Birthday"
    android:layout_width="150dp"
    android:layout_height="150"
    android:background="@android:color/darker_groy"
    >

there is a space between TextView at the first line 2,there is no dp next to 150 at the fourth line 3,the word at the fifth line and at the final must be gray but it is groy 4,the ending of the tag is like this > but it must be />

1.Space between Text and View
2.Unit is missing in line 3
3./ is missing
4.The spelling of gray is wrong

textview but you wroteit by having spece between Text and view android layout_high:150 instead of 150 dp
android:color/darker-groy instead of gray and the last closing tag of textview

Line 1- it should be written in CamelCase with no space, like <TextView
Line 2- attribute value has grammar error, "Happy Birthday"
Line 4- attribute value has no measurement unit, so add dp
Line 5- attribute value spelling error, darker_gray
Line 6- the forward / before the closing angle is missing

The tag name is invalid: it should be TextView instead of Text View. The closing tag is also missing the forward slash (/) before the closing angle bracket. In addition, the unit dp is missing. Finally, the background color is invalid; it should be darker_gray instead of darker_groy.