Fatal error: Uncaught TypeError: Twilio\Base\BaseClient::getAccountSid(): Return value must be of type string, null returned in C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\src\Twilio\Base\BaseClient.php:365 Stack trace: #0 C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\src\Twilio\Rest\Api\V2010.php(128): Twilio\Base\BaseClient->getAccountSid() #1 C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\src\Twilio\Rest\Api\V2010.php(276): Twilio\Rest\Api\V2010->getAccount() #2 C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\src\Twilio\Rest\Client.php(581): Twilio\Rest\Api\V2010->__get('account') #3 C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\src\Twilio\Base\BaseClient.php(298): Twilio\Rest\Client->contextAvailablePhoneNumbers('XX') #4 C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\example\incomingPhoneNumber.php(16): Twilio\Base\BaseClient->__call('availablePhoneN...', Array) #5 C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\example\incomingPhoneNumber.php(28): buyNumber() #6 {main} thrown in C:\xampp\htdocs\hannoole\POS\vendor\twilio\sdk\src\Twilio\Base\BaseClient.php on line 365