Laravel forms don't proccess external urls - laravel

Question

I have an application in Laravel 8 running in Cpanel. I have a form to edit blog posts. When I insert an external image to display in the body of the post and save the form the application crashes. when I remove the image the form works.
BadMethodCallException
Method App\Http\Controllers\Backend\NewsBackController::show does not exist.
The same app in another server works fine.
Update in controller
public function update(Request $request, $id)
{
$post = Post::find($id);
$post->title = $request->input('title');
$post->slug = $request->input('slug');
$post->sumary = $request->input('sumary');
$post->content = $request->input('content');
$post->img = $request->input('img');
$post->tag_id = $request->input('tag_id');
$post->pub_date = $request->input('pub_date');
$post->status = $request->input('status');
$post->save();
return redirect('backend-news/'.$id.'/edit')->with('success', 'Successful update!');
}
Form in blade
#csrf
<div class="row">
<div class="col-md-8">
<div class="form-group ">
<label >Title</label>
<input type="text" name='title' class="form-control" #if(!empty($content->title)) value="{{$content->title}}" #endif required>
</div>
#if ($form == 'update')
<div class="form-group ">
<label>Slug</label>
<input type="text" name='slug' class="form-control" #if(!empty($content->slug)) value="{{$content->slug}}" #endif>
</div>
#endif
<div class="form-group ">
<label >Sumary <small>(120 characters max.)</small></label>
<textarea name="sumary" class="form-control" rows="4">#if(!empty($content->sumary)){{$content->sumary}} #endif</textarea>
</div>
<div class="form-group ">
<label >Content</label>
<textarea name="content" class="form-control summernote" rows="15">#if(!empty($content->content)){{$content->content}} #endif</textarea>
</div>
</div>
<div class="col-md-4">
<div class="form-group">
<label>Image Large <small>(120 characters max.)</small></label>
<input type="text" name='img' class="form-control" #if(!empty($content->img)) value="{{$content->img}}" #endif>
</div>
<div class="row">
<div class="col-md-6">
<div class="form-group ">
<label for='group'>Tags</label>
<select class="form-control m-b" name="tag_id">
<option value='0'>--SELECT--</option>
#foreach ($tags as $tag)
#php
if($form == 'update'){
$selected = ($content->tag_id == $tag->id)?'selected':'';
}else{
$selected = '';
}
#endphp
<option value='{{$tag->id}}' {{$selected}}>{{$tag->name}}</option>
#endforeach
</select>
</div>
</div>
<div class="col-md-6">
<div class="form-group ">
<label >Pub Date</label>
<div class="input-group date">
<span class="input-group-addon"><i class="fa fa-calendar"></i></span><input type="text" class="form-control" name='pub_date'
#if (!empty($content->pub_date))
value="{{$content->pub_date}}"
#else
value="{{date('Y-m-d')}}"
#endif
>
</div>
</div>
</div>
</div>
<div class="form-group ">
<label for='group'>Status</label>
<select class="form-control m-b" name="status">
#if ($form == 'update')
#if ($content->status == 1)
<option value='1' selected>Published</option>
<option value='0'>Unpublish</option>
#else
<option value='1'>Published</option>
<option value='0' selected>Unpublish</option>
#endif
#else
<option value='1'>Published</option>
<option value='0'>Unpublish</option>
#endif
</select>
</div>
<div class="hr-line-dashed"></div>
<button type="submit" class="btn btn-w-m btn-success">Save</button>
#if(!empty($put))
<input type="hidden" name="_method" value="PUT">
#endif
<i class="fas fa-undo-alt"></i> Return
</div>
</div>
Thanks

Answer 1

First double check your controller, does it have show function or not?
If show function exists, run following artisan command:
php artisan cache:clear
php artisan config:cache
php artisan view:clear
php artisan route:clear
If show function doesn't exists, create it.
Hope this will be useful.