BackendlessFCMService is not assignable

I get this error in AndroidManifestr file:
‘com.backendless.push.BackendlessFCMService’ is not assignable to ‘’ less… (Ctrl+F1)
Inspection info: Validates resource references inside Android XML files.

My backendless SDK in build.gradle file:

      implementation  "com.backendless:backendless:5.3.0"

        // required for real-time database and real-time messaging
        implementation('') {
            // excluding org.json which is provided by Android
            exclude group: 'org.json', module: 'json'

please attach your full manifest file

make sure that you have added the following

implementation ''
implementation ''

step 4 in the doc

@saeed_noshadi is your problem resolved?

yes i changed google version in build.gradle(project) and solved it