Codeigniter4 のエラーについて

Codeigniter４を利用しております。
4.1.1になります。
以下のようなエラーがでており、改善の仕方がわかりません。
エラーをそのままコピーします。

CodeIgniter\Exceptions\FrameworkException

SYSTEMPATH/CodeIgniter.php at line 224

217             {
218                 $missingExtensions[] = $extension;
219             }
220         }
221 
222         if ($missingExtensions)
223         {
224             throw FrameworkException::forMissingExtension(implode(', ', $missingExtensions));
225         }
226     }
227 
228     //--------------------------------------------------------------------
229 
230     /**
231      * Initializes Kint

SYSTEMPATH/CodeIgniter.php : 224   —  CodeIgniter\Exceptions\FrameworkException::forMissingExtension ( arguments )

$extension	
intl
217             {
218                 $missingExtensions[] = $extension;
219             }
220         }
221 
222         if ($missingExtensions)
223         {
224             throw FrameworkException::forMissingExtension(implode(', ', $missingExtensions));
225         }
226     }
227 
228     //--------------------------------------------------------------------
229 
230     /**
231      * Initializes Kint
SYSTEMPATH/CodeIgniter.php : 172   —  CodeIgniter\CodeIgniter->resolvePlatformExtensions ()

165         // Setup Exception Handling
166         Services::exceptions()->initialize();
167 
168         // Run this check for manual installations
169         if (! is_file(COMPOSER_PATH))
170         {
171             // @codeCoverageIgnoreStart
172             $this->resolvePlatformExtensions();
173             // @codeCoverageIgnoreEnd
174         }
175 
176         // Set default locale on the server
177         locale_set_default($this->config->defaultLocale ?? 'en');
178 
179         // Set default timezone on the server
SYSTEMPATH/bootstrap.php : 159   —  CodeIgniter\CodeIgniter->initialize ()

152  *
153  * The CodeIgniter class contains the core functionality to make
154  * the application run, and does all of the dirty work to get
155  * the pieces all working together.
156  */
157 
158 $app = new CodeIgniter(new App());
159 $app->initialize();
160 
161 return $app;
162 
require FCPATH/index.php   —   require()

改善方法をご存知の方はおしえていただけませんでしょうか？