Swift compile error - Could not build Objective-C module 'RxAlamofire'

Question

I am using Swift 4.2 and Xcode 10.1 And while importing RxAlamofire to my project I am getting an error "Could not build Objective-C module 'RxAlamofire' ".

I have tried to clean the build folder and build it again. And also delete the Derived data folder and build again. But still getting the same error. Any help appreciated. Here is a screenshot of the error I'm getting:

Podfile

platform :ios, '9.0'
use_frameworks!
target 'RiderUser' do
pod "FlagPhoneNumber"
pod "KeychainAccess"
pod "SwiftyJSON"
pod "RxAlamofire"
pod "RxSwift"
end