kessel | …It 's the ship | Cron Utils library

I'm trying to use Twilio's API to send a sms with PHP. I followed the tutorial as it is presented on their website but it doesn't work. I correctly replaced the $sid, $token, "from number" and "to number" variables. I also tested it with Phyton and it worked correctly, but with PHP I get the following error:

Fatal error: Uncaught Twilio\Exceptions\ConfigurationException: Credentials are required to create a Client in C:\xampp\htdocs\Php\Twilio\vendor\twilio\sdk\src\Twilio\Rest\Client.php:172 Stack trace: #0 C:\xampp\htdocs\Php\Twilio\index.php(13): Twilio\Rest\Client->__construct('', '') #1

I'm using PHP 7.3.21 and xampp. I've saw this same error with people using laravel and more complex codes, but I'm using "pure" PHP. The code I'm using:

I'm new to Haskell and reading Haskell from first principles.

right now I'm on chapter 5. while solving its exercises, specifically 7,8 I could not understand why I'm not coming up with right answer

so here is the question

u can find questions and solutions here

If the type of kessel is (Ord a, Num b) => a -> b -> a, then the type of kessel 1 2 is:

1. Integer
2. Int
3. a
4. (Num a, Ord a) => a
5. Ord a => a
6. Num a => a

I think its answer is 5. Ord a => a, bcs its one of its possible implementation which I have come up with is to completely ignore parameter b

like this

Here's my code: