Problem resizing one original image two times

[eluser]Unknown[/eluser]
Hi I've the following problem

I upload one image in the directory ./images/originals

Then I want to resize this image to a compacter format. Therfore i resize it and create with the $config['new_image'] attribute a compact version in ./images/compact

After this i resize the original image to create a thumbnail version. Therfore i resize it with the $config['new_image'] attribute to create the thumbnail in ./images/thumbnails

The problem is that after the upload the thumbnail is created but the compact version is not. I don't know why. Maybe you can help me?

Here is the code

Code:

function save() {
            
        $config ['upload_path'] = './images/originals/';
        $config ['allowed_types'] = 'gif|jpg|png|jpeg';
        $config ['max_size'] = '2048';
        $config ['max_width'] = '0';
        $config ['max_height'] = '0';
        
        $this->load->library ( 'upload', $config );
            
        if ($this->upload->do_upload ()) {
            $data = array ('upload_data' => $this->upload->data () );
            $this->create_thumb( $data ['upload_data'] ['file_name'] );  // Thumbnail creation
            $this->create_compact( $data ['upload_data'] ['file_name'] ); // compact version creation
        } else {
            $error = array ('error' => $this->upload->display_errors () );
            $this->load->view ( 'upload_form', $error );
        }
    }

    function create_thumb($filename) {
    
        if(!is_dir("./images/thumbnails/".$this->user))
            mkdir("./images/thumbnails/".$this->user, 0777);
            
        $config ['image_library'] = 'GD';
        $config ['thumb_marker'] = '';
        $config ['source_image'] = './images/originals/' . $filename;
        $config ['new_image'] = './images/thumbnails/thumb_' . $filename;
        $config ['create_thumb'] = TRUE;
        $config ['maintain_ratio'] = TRUE;
        $config ['width'] = 100;
        $config ['height'] = 100;
        
        $this->load->library ( 'image_lib', $config );
        
        if ($this->image_lib->resize ()) {
            $data = array ('image' => $config ['new_image'] );
        } else {
            $data = array ('error' => $this->image_lib->display_errors () );
        }
        $this->load->view ( 'images_show', $data );
    }
    
    function create_compact($filename) {
        $config ['image_library'] = 'GD';
        $config ['quality'] = '80%';
        $config ['source_image'] = './images/originals/' . $filename;
        $config ['new_image'] = './images/compact/c' . $filename;
        $config ['maintain_ratio'] = TRUE;
        $config ['width'] = 800;
        $config ['height'] = 600;
        
        $this->load->library ( 'image_lib', $config );
        
        $this->image_lib->resize ();
    }