Could not get unknown property 'implementation' for object of type Dependency

Hello there after adding dependency of paging

val paging_version = "3.1.0"

implementation("androidx.paging:paging-runtime:$paging_version")

I’m getting this error

Could not set unknown property 'paging_version' for object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler

Note: I have switched my project from java to kotlin ( because there
is some issue the entire project cant be converted so I convert every
java file one by one)

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>Solution :

I have added it like this and it works:

implementation 'androidx.paging:paging-runtime-ktx:3.1.0"'