Error inserting values

PHP
1

hi.
i have written this code to add contact details but it says error inserting values.


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
 
<title>Add Contact Details</title>
<style type="text/css">
html,body {
            margin: 0px;
}
.text {
        color: green;
}
table{
            border: 1px solid black;
            border-collapse: collapse;
            background-color: #d6e5f4;
            width: 700px;

            
}
th{
            border: 1px solid black;
            padding: 5px 5px 5px 5px;
            width: 200px;
            font-size: 15px;
            font-family: Georgia, serif;
            color: brown;
            
}
td{
            border: 1px solid black;
            padding: 5px 5px 5px 15px;
            text-align: left;
}
table .iptd {
              padding: 5px 5px 5px 5px;
              border: 2px dashed black;
              border-color: purple;
              width: 250px;
}
.txtarea {
           border: 3px solid #cccccc;
           padding: 7px;
           font-family: Georgia, serif;
           color: black;
}
.img {
           border: 3px solid #cccccc;
           padding: 7px;
           width: 350px;
}
.error {
    font-size: 20px;
    color: brown;
}
.heading {
          font-family:  fantasy;
          font-size: 30px;
          text-align: center;
          color: #8B0000;      
          border: 2px solid black;
}
</style>
</head>

<body>
<?php 
 if(isset($_POST['contactadd']))
   {
    $fname = $_POST['fname'];
    $lname = $_POST['lname'];
    $homead = $_POST['homead'];
    $offad = $_POST['offad'];
    $llno = $_POST['llno'];
    $mobno1 = $_POST['mobno1'];
    $mobno2 = $_POST['mobno2'];
    $email = $_POST['email'];
    $image = $_FILES['image']['name'];
    $description = $_POST['description'];
    
    
    if( (!empty($fname)) && (!empty($lname)) &&(!empty($homead)) && (!empty($offad)) && (!empty($llno)) && 
       (!empty($mobno1)) && (!empty($mobno2)) && (!empty($email)) && (!empty($image)) && (!empty($description)))
       
       
                       {
                         $dbc = mysqli_connect('localhost','username','password','addcontact')
                                 or die('Error Connecting to Mysql');
                                 
                         $query = "INSERT INTO contactlist VALUES('$fname','$lname','$homead',$offad','$llno','$mobno1','$mobno2','$email','$image','$description')";
                         mysqli_query($dbc,$query)
                           or die('Error Inserting Values');
                         mysqli_close($dbc);
                       }
    else
       {
        echo '<center><p class="error">Some of the data entered is wrong or incomplete</p></center>';
       }
   }
?>
   <center>
     <form action="<?php echo $_SERVER['PHP_SELF']; ?>" enctype="multipart/form-data" method="post"> 
            <table>
                <tr>
                   <td class="heading"><b>ADD CONTACT TO DATABASE</b></td>
                </tr>
            </table>
          <table>
                <tr>
                   <th><em>FIRST NAME:</em></th>
                   <td><input type="text" name="fname" class="iptd" value="<?php if(!empty($fname)) echo $fname; ?>" /></td>
                </tr>
                <tr>
                   <th><em>LAST NAME:</em></th>
                   <td><input type="text" name="lname" class="iptd"  value="<?php if(!empty($lname)) echo $lname; ?>" /></td>
                </tr>
                <tr>
                  <th rowspan="2"><em>ADDRESS</em></th>
                   <td class="text">RESIDENCE:<br /><textarea  class="txtarea" cols="60" rows="18" name="homead"><?php if(!empty($homead)) echo $homead; ?></textarea></td>
                </tr>
                <tr>
                  <td class="text">OFFICE:<br /><textarea  class="txtarea" cols="60" rows="18" name="offad"><?php if(!empty($offad)) echo $offad; ?></textarea></td>
                </tr>
                <tr>
                  <th rowspan="3"><em>TELEPHONE NO'S:</em></th>
                   <td class="text">LANDLINE:<br /><input type="text"  class="iptd" name="llno" value="<?php if(!empty($llno)) echo $llno; ?>" /></td>
                </tr>
                <tr>
                   <td class="text">MOBILE NO 1:<br /><input type="text"  class="iptd" name="mobno1" value="<?php if(!empty($mobno1)) echo $mobno1; ?>" /></td>
                </tr>
                <tr>
                   <td class="text">MOBILE NO 2:<br /><input type="text"  class="iptd" name="mobno2" value="<?php if(!empty($mobno2)) echo $mobno2; ?>" /></td>
                </tr>
                <tr>
                  <th><em>EMAIL-ID:</em></th>
                  <td><input type="text" name="email" class="iptd" value="<?php if(!empty($email)) echo $email; ?>" /></td>
                </tr>
                <tr>
                   <th><em>UPLOAD IMAGE:</em></th>
                   <td><input type="file" class="img" name="image" alt="picture" /></td>
                </tr>
                <tr>
                  <th><em>RELATION<br /></em>(OR)<br /><em>DESCRIPTION:</em><br />( Say a Few words about this person)</th>
                  <td><textarea rows="12" cols="40" name="description" class="txtarea"><?php if(!empty($description)) echo $description; ?></textarea></td>
                </tr>
                <tr>
                  <th></th>
                  <td><input type="submit" name="contactadd" value="ADD CONTACT" /></td>
                </tr>
                
          </table>
          
     
     
     
     </form>
   </center>


</body>
</html>
2

And that isn’t very useful, is it?
Just for debugging purposes, change this line

mysqli_query($dbc,$query)
                           or die('Error Inserting Values');

in

mysqli_query($dbc,$query)
                           or die('Error Inserting Values ' . mysqli_error() . ' in query $query');