php - Cakephp Form is not getting submiited but giving Notice (8): Array to string Coversion, many other Warnings (2) -

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i having trouble submitting/saving data cakephp model. constructed form usual do, time getting notices , warning data not getting saved. here form have constructed , method in controller:

educationaldetails.ctp

<?php if (empty($education)):      echo $this->form->create('candidate', array('class' => 'dynamic_field_form'));      echo $this->form->input('candidateseducation.0.candidate_id', array(         'type' => 'hidden',         'value' => $userid     ));      echo $this->form->input('candidateseducation.0.grade_level', array(         'options' => array(             'basic' => 'basic',             'masters' => 'masters',             'doctorate' => 'doctorate',             'certificate' => 'certificate'         )     ));      echo $this->form->input('candidateseducation.0.course');      echo $this->form->input('candidateseducation.0.specialization');      echo $this->form->input('candidateseducation.0.university');      echo $this->form->input('candidateseducation.0.year_started', array(         'type' => 'year'     ));      echo $this->form->input('candidateseducation.0.year_completed', array(         'type' => 'year'     ));      echo $this->form->input('candidateseducation.0.type', array(         'options' => array(             'full' => 'full',             'part-time' => 'part-time',             'correspondence' => 'correspondence'     )));      echo $this->form->input('candidateseducation.0.created_on', array(         'type' => 'hidden',         'value' => date('y-m-d h:i:s')     ));      echo $this->form->input('candidateseducation.0.created_ip', array(         'type' => 'hidden',         'value' => $clientip     ));      echo $this->form->button('submit', array('type' => 'submit', 'class' => 'submit_button'));      echo $this->form->end();  endif;

candidatescontroller.php

public function educationaldetails() {         $this->layout = 'front_common';          $this->loadmodel('candidateseducation');          $education = $this->candidateseducation->find('first', array(             'conditions' => array(                 'candidate_id = ' => $this->auth->user('id')             )         ));          $this->set('education', $education);          // checking if in case candidates education available polpulate form         if (!empty($education)):             // if form empty populating form respective data.             if (empty($this->request->data)):                 $this->request->data = $education;             endif;         endif;          if ($this->request->is(array('post', 'put')) && !empty($this->request->data)):              $this->candidate->id = $this->auth->user('id');             if ($this->candidate->saveassociated($this->request->data)):                 $this->session->setflash('you educational details has been updated', array(                     'class' => 'success'                 ));                 return $this->redirect(array(                             'controller' => 'candidates',                             'action' => 'jbseeker_myprofile',                             $this->auth->user('id')                 ));             else:                 $this->session->setflash('you personal details has not been '                         . 'updated successfully, please try again later!!', array(                     'class' => 'failure'                 ));             endif;          endif; }

here screenshot enter image description here of errors getting, not able figure out happening while other forms working correctly. looks something wrong view?

this error coming out because not passing proper arguments session->setflash() method, doing this:

   $this->session->setflash('you personal details has not been updated successfully, please try again later!!', array(         'class' => 'failure'     ));

in docs mentioned like:

   $this->session->setflash('you personal details has not been updated successfully, please try again later!!',         'default', array(            'class' => 'failure'     ));

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