Getting the error of undefined variable while submitting data to database

When i submit the registration form's data it is showing the following error....but the data is inserted in the database while viewing i am getting this error

A PHP Error was encountered

Severity: Notice

Message: Undefined variable: dbRet

Filename: models/registration_model.php

Line Number: 47

Model code

      public function save_registration($un,$email,$pwd,$utype)
      $data = array(
   'username' => $un,
   'password' => $pwd,
   'email' => $email
        $dbRet=$this->db->insert('business', $data);    
        $dbRet-$this->db->insert('user', $data);
      if (!$dbRet) {
      $ret['ErrorMessage'] = $this->db->_error_message();
      $ret['ErrorNumber'] = $this->db->_error_number();
      log_message('error', "DB Error: (".$ret['ErrorNumber'].") ".$ret['ErrorMessage']);
      return $ret['ErrorNumber'];
      return $rid;

As i am new to this please give me the solution
geetika joshiAsked:
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Loganathan NatarajanLAMP DeveloperCommented:
This line may be wrong?
$dbRet-$this->db->insert('user', $data);

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It should be,

$dbRet = $this->db->insert('user', $data);

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Dave BaldwinFixer of ProblemsCommented:
Agreed  ^^^  That will cause the error in the line that follows:

 if (!$dbRet) {
geetika joshiAuthor Commented:
what could be the solution?? as i am new to this please guide me
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Dave BaldwinFixer of ProblemsCommented:
Replace that line with the one @Loganathan Natarajan showed you above.
geetika joshiAuthor Commented: it done problem solved thank you  both of you

Now i am getting this error

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/clubhouzz/public_html/application/controllers/registration.php:17)

Filename: libraries/Session.php

Line Number: 688
Loganathan NatarajanLAMP DeveloperCommented:
You may be printing some where on this file registration.php:17
just comment it. So there won't be any session prob
Dave BaldwinFixer of ProblemsCommented:
'session_start' must come before any HTML or text output because it sets a cookie which is part of the 'response headers' that are sent before a web page.  Sounds like you may things in the wrong order.
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