setup:di:compile throws an error

[gunnie-agency]

Installed buckaroo/magento2 version 2.3.1
Installed buckaroo/magento2graphql version 1.1.1

bin/magento setup:di:compile
Compilation was started.
Interceptors generation... 4/9 [============>---------------]  44% 11 secs 264.0 MiB
In Generator.php line 140:

  Class "Buckaroo\Magento2\Api\TransactionResponseInterfaceFactory" does not exist
  Class Buckaroo\Magento2Graphql\Resolver\Cart\ProcessTransactionOutput\Interceptor generation error: The requested class did
  not generate properly, because the 'generated' directory permission is read-only. If --- after running the 'bin/magento setu
  p:di:compile' CLI command when the 'generated' directory permission is set to write --- the requested class did not generate
   properly, then you must add the generated class object to the signature of the related construct method, only.