whmcs module problem

[dewdropz]

can anyone tell. how i can solve this problem?

 

[06-Jun-2017 08:05:19 UTC] [WHMCS Application] ERROR: exception 'Whoops\Exception\ErrorException' with message 'Class 'Httpful\Bootstrap' not found' in /home/account/public_html/billing/modules/gateways/spectrocoin/lib/SCMerchantClient/httpful.phar:5 Stack trace: #0 /home/account/public_html/billing/vendor/filp/whoops/src/Whoops/Run.php(383): Whoops\Run->handleError(1, 'Class 'Httpful\\...', '/home/account/pu...', 5) #1 [internal function]: Whoops\Run->handleShutdown() #2 {main} {"exception":"[object] (Whoops\\Exception\\ErrorException(code: 1): Class 'Httpful\\Bootstrap' not found at /home/account/public_html/billing/modules/gateways/spectrocoin/lib/SCMerchantClient/httpful.phar:5)"} []

[sentq]

you may need to contact the author of this module for better answer https://github.com/SpectroFinance/SpectroCoin-Merchant-WHMCS

[dewdropz]

they also not understand why this problem occur? they tell me they think i don't enable something in my server.. they try to find it..