Notice: Undefined index in php and html file

[emaus9]

    index.html file



<form id="form" method="post" action="formdata.php" enctype="text/plain" autocomplete="on" target="_blank">

                 <!-- onsubmit="return confirm('Your request have been submitted. Thank You.')"  onsubmit="this.submit(); this.reset(); return false;">-->        
                <fieldset>
                <legend>Get a FREE Quote</legend>
                      <label for="flname">First and Last name:</label><input type="text" name="flname" autofocus placeholder="Please type your first and last name." size="40" required /><br>
                     <!-- <label for="lname">Last name: </label><input type="text" name="lname" autofocus placeholder="Please type your last name." size="40" required><br>-->
                      <label for="email">E-mail: </label><input type="email" name="email" autocomplete="off" autofocus placeholder="Please type your e-mail." size="40" required /><br>
                      <label for="tel">Telephone: </label><input type="text" name="tel" autofocus placeholder="Please enter your phone number." size="40" required /><br>
                      Describe Request:<textarea name="DescRequest" autofocus placeholder="Please describe your request." maxlength="500" required>

[emaus9]

undefined names submit, flname, email, tel, descrequest and so forth