CodeIgniter: Undefined property: stdClass::$CategoryID - php

Question

I'm inner joining two databases together here, when using the separate views individually they work fine, so do the databases, I think the cause of this is the inner join, but putting the query directly into phpmyadmin and replacing the $categoryID with a number works.
Some rows load, such as the images, but joined variables are undefined, What is causing the variables to be undefined?
Model:
function DisplayBySpecificCategory($categoryID)
{
$query = $this->db->query("SELECT * FROM CIUploads
INNER JOIN CIUsers ON CIUploads.UserID = CIUsers.UserID
WHERE CIUploads.UploadCategoryID = $categoryID
ORDER BY CIUploads.UploadTime DESC");
return $query->result();
}
Controller:
function SpecificCategory()
{
$categoryID=$this->uri->segment(3);
$this->load->model('Previews_model');
$this->load->model('Category_model');
$this->load->view('../includes/header.php');
$data['category'] = $this->Category_model->GenerateCategoryHeader($categoryID);
$data['allwork'] = $this->Previews_model->DisplayBySpecificCategory($categoryID);
$this->load->view('headers/Specific_category_header', $data);
$this->load->view('previews/Previews_view', $data);
$this->load->view('../includes/footer.php');
}
Header view:
<?php foreach ($category as $value2){ ?>
<header style="background-color:#<?php echo $value2->CategoryColor ?>">
<div class="container">
<div class="row">
<div class="col-lg-12">
<div class="page-intro">
<h1 class="inverted text-center"><?php echo $value2->CategoryTitle ?></h1>
<p class="inverted text-center"><?php echo $value2->CategoryDescription ?></p>
</div>
</div>
</div>
</div>
</header>
<?php } ?>
Previews view:
<?php
if($value->UploadCategoryID == 2){
echo '<video muted class="video-responsive fit-centered">';
echo '<source src="'.base_url("/public/uploads/works")."/".$value->UploadedAt.'" type="video/mp4">Your browser does not support the video tag.';
echo '</video>';
}
else if($value->UploadCategoryID == 3){
echo '<iframe class="fit-centered" src="http://'.$value->UploadedAt.'" scrolling="no"></iframe>';
}
else{
echo '<img class="img-responsive fit-centered" src="'.base_url("/public/uploads/works")."/".$value->UploadedAt.'" alt="'.$value->UploadTitle.'">';
} ?>
<div class="overlay">
<p>
<i class="fa fa-eye fa-3x ease-color"></i>
</p>
</div>
</div>
<div class="hovereffect-information no-bounding">
<span class="category-tab pull-right text-center inverted" style="background-color:#<?php echo $value->CategoryColor ?>"><i class="fa <?php echo $value->CategoryIcon ?>"></i></span>
<p class="pull-left no-bounding text-uppercase preview-info"><?php echo $value->UploadTitle ?></p>
<img class="img-responsive small-profile-img pull-right hover-dim fit-centered" src="<?php echo base_url("/public/uploads/profile-images/")."/".$value->ProfileImg ?>" alt="<?php echo $value->Username ?>"/>
<p class="pull-left no-bounding text-uppercase preview-info">
<span class="preview-span"> <i class="fa fa-eye"></i> <?php echo $value->UploadViews ?> </span> |
<span class="preview-span"> <i class="fa fa-heart"></i> <?php echo $value->UploadLikes ?> </span> |
<span class="preview-span"> <i class="fa fa-comments"></i> <?php echo $value->UploadComments ?> </span>
</p>
</div>
</div>
<?php } ?>
Error:
Severity: Notice
Message: Undefined property: stdClass::$CategoryIcon
Filename: previews/Previews_view.php
Line Number: 31
Backtrace:
File:
/web/stud/u1263522/cmw/application/views/previews/Previews_view.php
Line: 31 Function: _error_handler
File:
/web/stud/u1263522/cmw/application/controllers/Views_controller.php
Line: 64 Function: view
File: /web/stud/u1263522/cmw/index.php Line: 292 Function:
require_once

Answer 1

In the question you have mentioned : Undefined property: stdClass::$CategoryID
whereas the error shows : Undefined property: stdClass::$CategoryIcon
If $CategoryIcon is undefined it means that you do not have a column called CategoryIcon in any of your tables.
Can you mention the details of the tables?
It is always a good practice to mention the column names in the query instead of *.

Answer 2

add your loading model before called in Controller , Check name is correct , Make sure that some name in (model = Class)
$this->load->model('model_name'); //
Or in Confige.php