android layout - Error Parsing XML: not well formed (invalid token) -


i'm receiving following message when compiling android project:

error parsing xml: not well-formed (invalid token)

this xml layout file error supposed be:

    <?xml version="1.0" encoding="utf-8"?>     <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"         android:orientation="vertical" android:layout_width="match_parent"         android:layout_height="match_parent">          <relativelayout             android:layout_width="match_parent"             android:layout_height="match_parent"             android:layout_weight="0.5"             android:layout_marginend="5dp"             android:layout_marginstart="5dp">              <textview                 android:id="@+id/ph_view"                 android:text="ph= "                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_margintop="20dp"                 android:layout_marginbottom="20dp"                 android:textsize="20sp"                 android:layout_marginstart="10sp"                  />             <textview                 android:id="@+id/ph_data"                 android:textsize="18sp"                 android:text=""                 android:layout_toleftof="@id/ph_graph"                 android:layout_alignbaseline="@id/ph_view"                 android:layout_margin="5dp"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_alignbottom="@id/ph_view"                  />             <button                 android:text="graph"                 android:id="@+id/ph_graph"                 android:layout_alignparentend="true"                 android:layout_alignbaseline="@id/ph_view"                 android:textallcaps="false"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                  />              <textview                 android:id="@+id/ec_view"                 android:text="ec (us/cm2)= "                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_centervertical="true"                 android:layout_margintop="20dp"                 android:layout_marginbottom="20dp"                 android:textsize="20sp"                 android:layout_marginstart="10sp"                 android:layout_below="@id/ph_view"                  />             <textview                 android:id="@+id/ec_data"                 android:textsize="18sp"                 android:text=""                 android:layout_toleftof="@id/ec_graph"                 android:layout_alignbaseline="@id/ec_view"                 android:layout_margin="5dp"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 />              <button                 android:text="graph"                 android:id="@+id/ec_graph"                 android:layout_alignparentend="true"                 android:layout_alignbaseline="@id/ec_view"                 android:textallcaps="false"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 />              <textview                 android:id="@+id/do_view"                 android:text="dissolved oxygen= "                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_centervertical="true"                 android:layout_margintop="20dp"                 android:layout_marginbottom="20dp"                 android:textsize="20sp"                 android:layout_marginstart="10sp"                 android:layout_below="@id/ec_view"                  />             <textview                 android:id="@+id/do_data"                 android:textsize="18sp"                 android:text=""                 android:layout_toleftof="@id/ec_graph"                 android:layout_alignbaseline="@id/do_view"                 android:layout_margin="5dp"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 />              <button                 android:text="graph"                 android:id="@+id/do_graph"                 android:layout_alignparentend="true"                 android:layout_alignbaseline="@id/do_view"                 android:textallcaps="false"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 />             <textview                 android:id="@+id/restemp_view"                 android:text="reservoir temp (c)= "                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_centervertical="true"                 android:layout_margintop="20dp"                 android:layout_marginbottom="20dp"                 android:textsize="20sp"                 android:layout_marginstart="10sp"                 android:layout_below="@id/do_view"                  />             <textview                 android:id="@+id/restemp_data"                 android:textsize="18sp"                 android:text="none"                 android:layout_toleftof="@id/ec_graph"                 android:layout_alignbaseline="@id/restemp_view"                 android:layout_margin="5dp"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 />              <button                 android:text="graph"                 android:id="@+id/restemp_graph"                 android:layout_alignparentend="true"                 android:layout_alignbaseline="@id/restemp_view"                 android:textallcaps="false"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 />             <textview                android:id="@+id/grovetemp_view"                android:text="grove temp (c)= "                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:layout_centervertical="true"                android:layout_margintop="20dp"                android:layout_marginbottom="20dp"                android:textsize="20sp"                android:layout_marginstart="10sp"                android:layout_below="@id/restemp_view"                />            <textview                android:id="@+id/grovetemp_data"                android:textsize="18sp"                android:text="none"                android:layout_toleftof="@id/ec_graph"                android:layout_alignbaseline="@id/grovetemp_view"                android:layout_margin="5dp"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                />              <button                 android:text="graph"                 android:id="@+id/grovetemp_graph"                 android:layout_alignparentend="true"                 android:layout_alignbaseline="@id/grovetemp_view"                 android:textallcaps="false"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 />           </relativelayout>          <relativelayout             android:layout_height="match_parent"             android:layout_width="match_parent"             android:layout_weight="1"             android:orientation="horizontal"             android:layout_margin="40dp">               <button                 android:id="@+id/requestconnection"                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:layout_gravity="center"                 android:text="request connection"                 android:onclick="requestconnection"                 android:layout_centerinparent="true"                 />              <button                 android:id="@+id/requestreading"                 android:layout_height="wrap_content"                 android:layout_width="wrap_content"                 android:layout_gravity="center"                 android:text="request reading"                 android:onclick="requestreading"                 android:layout_centerinparent="true"                 />         </>     </linearlayout>

can me find problem is? missing something?

</> not valid token in xml file.

the closing tag of relativelayout should </relativelayout>


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