# Getting error while updating slim

**URL:** <https://discourse.slimframework.com/t/getting-error-while-updating-slim/5039>\
**Category:** Questions\
**Created:** [December 10, 2021, 8:20am UTC](https://discourse.slimframework.com/t/getting-error-while-updating-slim/5039 "2021-12-10T08:20:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![zainh7512](https://avatars.discourse-cdn.com/v4/letter/z/f0a364/32.png) [@zainh7512](https://discourse.slimframework.com/u/zainh7512)\
**Post date:** [December 10, 2021, 8:20am UTC](https://discourse.slimframework.com/t/getting-error-while-updating-slim/5039/1 "2021-12-10T08:20:20Z")

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I am trying to update slim and getting below giving error. Please help.

**Fatal error** : Uncaught ArgumentCountError: Too few arguments to function Slim\App::\_\_construct(), 0 passed in C:\xampp\htdocs\fotoschulebaur\index.php on line 15 and at least 1 expected in C:\xampp\htdocs\fotoschulebaur\vendor\slim\slim\Slim\App.php:62 Stack trace: #0 C:\xampp\htdocs\fotoschulebaur\index.php(15): Slim\App-\>\_\_construct() #1 {main} thrown in **C:\xampp\htdocs\fotoschulebaur\vendor\slim\slim\Slim\App.php** on line **62**

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**Author:** ![odan](https://avatars.discourse-cdn.com/v4/letter/o/9de053/32.png) [@odan](https://discourse.slimframework.com/u/odan)\
**Post date:** [December 10, 2021, 9:19am UTC](https://discourse.slimframework.com/t/getting-error-while-updating-slim/5039/2 "2021-12-10T09:19:10Z")

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Are you trying to upgrade from Slim 3 to Slim 4?

In this case, you need to change how the Slim App instance is created.

For example.

Before, in Slim 3:

```php
use Slim\App;

$app = new App();

```

In Slim4 change it to:

```php
use Slim\Factory\AppFactory;

$app = AppFactory::create();
// ...

```

Read more: [Slim 4 Upgrade Guide](https://www.slimframework.com/docs/v4/start/upgrade.html)

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<div class="post-metadata">

**Author:** ![zainh7512](https://avatars.discourse-cdn.com/v4/letter/z/f0a364/32.png) [@zainh7512](https://discourse.slimframework.com/u/zainh7512)\
**Post date:** [December 10, 2021, 9:35am UTC](https://discourse.slimframework.com/t/getting-error-while-updating-slim/5039/3 "2021-12-10T09:35:49Z")

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i already change this