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Incorrect integer value: '' for column 'id' at row 1

help i got this error when i try to insert a new item in my table.

my form:
<div class="main">
<div class="main-content">
<h1 class="block">MEMBERSHIP LOGIN</h1>
<div class="column1-unit">
<h1>Create Free Account Now</h1>
<div class="loginform">
&lt;?php echo form_open('homepage/addNewMember'); ?&gt;
<p><label class="top">Reffered By:</label><br />
&lt;input type="text" name="reffered" tabindex="1" class="field" value="" placeholder="Reference Username" /&gt;

<p><label class="top">Username:</label><br />
&lt;input type="text" name="username" tabindex="1" class="field" value="" placeholder="Desired Username" /&gt;

<p><label class="top">Last Name</label><br />
&lt;input type="text" name="lastname" tabindex="2" class="field" value="" placeholder="Your Last Name" /&gt;

<p><label class="top">First Name:</label><br />
&lt;input type="text" name="firstname" tabindex="1" class="field" value="" placeholder="Your First Name" /&gt;

<p><label class="top">Middle Name:</label><br />
&lt;input type="text" name="middlename" tabindex="1" class="field" value="" placeholder="Your Middle Name" /&gt;

<p><label class="top">Email Address:</label><br />
&lt;input type="text" name="email" tabindex="1" class="field" value="" placeholder="[email protected]" /&gt;

<p><label class="top">Mobile Number:</label><br />
&lt;input type="text" name="contact" tabindex="1" class="field" value="" placeholder="xxxx-xxx-xxxx" /&gt;

<p><label class="top">Gender: </label><br />
<select name="gender">
<option value="">---</option>
<option value="Male">Male</option>
<option value="Female">Female</option>

<p><label class="top">Password: </label><br />
&lt;input type="password" name="password" tabindex="1" class="field" value="" placeholder="8 to 16 characters only" /&gt;

<p><label class="top">Confirm Password: </label><br />
&lt;input type="password" name="passcon"tabindex="1" class="field" value="" placeholder="Re-type password" /&gt;

<p>&lt;input type="submit" name="cmdweblogin" class="button" value="CREATE" /&gt;&lt;/p>
my controller method

public function addNewMember(){
my model method

public function addNewMember(){
$data = array(
'id' => '',
'username' => strtolower($this->input->post('username')),
'lastname' => ucwords($this->input->post('lastname')),
'firstname' => ucwords($this->input->post('firstname')),
'middlename' => ucwords($this->input->post('middlename')),
'gender' => $this->input->post('gender'),
'email_address' => strtolower($this->input->post('email')),
'mobile_number' => $this->input->post('contact'),
'reffered_by' => $this->input->post('reffered'),
'password' => md5($this->input->post('password')),
'date_registered' => date('Y-m-d h:iConfused')
return $this->db->insert('tbl_member',$data);
my table structure
CREATE TABLE tbl_member(
id int unsigned auto_increment,
username varchar(50) unique not null,
lastname varchar(50) not null,
firstname varchar(50) not null,
middlename varchar(50) not null,
gender enum('Male','Female'),
email_address varchar(50) not null,
mobile_number int not null,
reffered_by varchar(50),
password varchar(50) not null,
date_registered datetime

You're trying to insert an empty string into an integer column. The ID is an auto-increment column that will populate itself, so leave the ID out of the insert.

ok thanks

No problem. Next time, please put your code in code tags like my sig shows so it will be easier to read.

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