For the folloinwg code:

# Generate button
    if st.button("🎯 Generate Slides", type="primary", use_container_width=True):
        with st.spinner("Generating presentation... This may take a moment."):
            try:
                # Get the SAA instance
                json_path = os.path.abspath('cache/cache.json')
                saa = ScalableSAA(json_path)
                
                # Set the results container
                saa.rc = st.session_state.results
                
                # Generate slides and get the expected path
                expected_path = saa.generate_slides_subprocess()
                
                # Check if we got a valid path
                if expected_path is None:
                    st.error("Slide generation returned no path. Checking for files...")
                    
                    # Try to construct the expected path manually
                    if hasattr(saa, 'paths') and hasattr(saa, 'run_key'):
                        slide_deck_out_folder = saa.paths.folders.get('slide_deck_out')
                        if slide_deck_out_folder:
                            expected_path = os.path.join(slide_deck_out_folder, f'{saa.run_key}.pptx')
                            st.info(f"Checking for file at: {expected_path}")
                        else:
                            st.error("Could not determine output folder from SAA instance")
                    else:
                        st.error("SAA instance missing required attributes (paths or run_key)")
                
                if expected_path:
                    # Wait for the file to be created (max 30 seconds)
                    max_wait_time = 30
                    wait_interval = 0.5
                    elapsed_time = 0
                    
                    st.info(f"Waiting for file at: {expected_path}")
                    
                    while elapsed_time < max_wait_time:
                        if os.path.exists(expected_path):
                            # File exists, wait a bit more to ensure it's fully written
                            time.sleep(1)
                            
                            # Verify file size is stable (not still being written)
                            try:
                                initial_size = os.path.getsize(expected_path)
                                time.sleep(0.5)
                                final_size = os.path.getsize(expected_path)
                                
                                if initial_size == final_size and final_size > 0:
                                    st.session_state.slides_path = expected_path
                                    st.session_state.slides_generated = True
                                    st.success(f"File found! Size: {final_size / (1024*1024):.2f} MB")
                                    st.rerun()
                                    break
                            except Exception as e:
                                st.warning(f"Error checking file size: {e}")
                        
                        time.sleep(wait_interval)
                        elapsed_time += wait_interval
                    
                    if not st.session_state.slides_generated:
                        st.error(f"File was not created after {max_wait_time} seconds")
                        
                        # Check if directory exists and list contents
                        if expected_path:
                            expected_dir = os.path.dirname(expected_path)
                            if os.path.exists(expected_dir):
                                files = os.listdir(expected_dir)
                                st.info(f"Files in {expected_dir}: {files}")
                                
                                # Look for any .pptx files
                                pptx_files = [f for f in files if f.endswith('.pptx')]
                                if pptx_files:
                                    st.info(f"Found PowerPoint files: {pptx_files}")
                                    # Use the most recent one
                                    latest_file = max(pptx_files, key=lambda f: os.path.getctime(os.path.join(expected_dir, f)))
                                    latest_path = os.path.join(expected_dir, latest_file)
                                    st.session_state.slides_path = latest_path
                                    st.session_state.slides_generated = True
                                    st.success(f"Using file: {latest_file}")
                                    st.rerun()
                            else:
                                st.error(f"Output directory does not exist: {expected_dir}")
                                # Try to create it
                                try:
                                    os.makedirs(expected_dir, exist_ok=True)
                                    st.info(f"Created directory: {expected_dir}")
                                except Exception as e:
                                    st.error(f"Could not create directory: {e}")
                
            except Exception as e:
                st.error(f"❌ Error generating slides: {str(e)}")
                logging.error(f"Slide generation error: {str(e)}", exc_info=True)
                st.session_state.slides_generated = False
                
                # Try to provide more debugging info
                if hasattr(locals(), 'saa'):
                    st.info("SAA instance attributes:")
                    if hasattr(saa, 'paths'):
                        st.info(f"- Has paths: Yes")
                        if hasattr(saa.paths, 'folders'):
                            st.info(f"- Folders: {list(saa.paths.folders.keys())}")
                    else:
                        st.info(f"- Has paths: No")
                    if hasattr(saa, 'run_key'):
                        st.info(f"- Run key: {saa.run_key}")
                    else:
                        st.info(f"- Has run_key: No")
    
    # Download button - only show if slides have been generated
    if st.session_state.slides_generated and st.session_state.slides_path:
        if os.path.exists(st.session_state.slides_path):
            try:
                with open(st.session_state.slides_path, "rb") as file:
                    file_data = file.read()
                
                st.download_button(
                    label="📥 Download Presentation",
                    data=file_data,
                    file_name=f"presentation_{time.strftime('%Y%m%d_%H%M%S')}.pptx",
                    mime="application/vnd.openxmlformats-officedocument.presentationml.presentation",
                    use_container_width=True
                )
                st.success("✅ Presentation ready for download!")
            except Exception as e:
                st.error(f"Error reading file: {str(e)}")
                st.session_state.slides_generated = False
        else:
            st.warning("Generated file not found. Please regenerate.")
            st.session_state.slides_generated = False
    
    # File information - always show if slides have been generated
    if st.session_state.slides_path and st.session_state.slides_generated:
        with st.expander("📁 File Information", expanded=False):
            st.text(f"Location: {st.session_state.slides_path}")
            if os.path.exists(st.session_state.slides_path):
                file_size = os.path.getsize(st.session_state.slides_path) / (1024 * 1024)  # Convert to MB
                st.text(f"Size: {file_size:.2f} MB")
                mod_time = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(os.path.getmtime(st.session_state.slides_path)))
                st.text(f"Generated: {mod_time}")
    
else:
    st.error("No analysis results available. Please run optimization first.")

I get this weird error but I dont know why

PermissionError: [Errno 13] Permission denied: 'C:\\Users\\knolseb\\dev\\ScalableSAA_engine\\cache\\cover.pptx'