Coinbase commerce gateway error

[jivarengx 0]

I tried to set up coinbase commerce gateway application on my website (IPS 4.4) and i faced this error after i installed the application and tried to add payment method as the instruction said.

Error: Class 'IPS\nexus\Gateway\CoinbaseCommerce' not found (0)
#0 /home/fancbiis/public_html/system/Helpers/Wizard/Wizard.php(181): IPS\nexus\modules\admin\payments\_gateways->IPS\nexus\modules\admin\payments\{closure}(Array)
#1 /home/fancbiis/public_html/system/Theme/Theme.php(840) : eval()'d code(1841): IPS\Helpers\_Wizard->__toString()
#2 /home/fancbiis/public_html/system/Theme/SandboxedTemplate.php(61): IPS\Theme\class_core_admin_global->globalTemplate('94659c675ca40d7...', Object(IPS\Helpers\Wizard), Array)
#3 /home/fancbiis/public_html/system/Dispatcher/Dispatcher.php(172): IPS\Theme\_SandboxedTemplate->__call('globalTemplate', Array)
#4 /home/fancbiis/public_html/system/Dispatcher/Standard.php(118): IPS\_Dispatcher->finish()
#5 /home/fancbiis/public_html/system/Dispatcher/Dispatcher.php(154): IPS\Dispatcher\_Standard->finish()
#6 /home/fancbiis/public_html/admin/index.php(14): IPS\_Dispatcher->run()
#7 {main}

I tried a few things but i couldnt find a fix.. I am fairly new to this so i am sorry if my question is dumb to you.

[Tony 5,207]

First line tells you what your issue is: you're missing files.