Refering other modules class which has other scala version

Question

I have 2 modules. API and Calculator

API is depend on scala version 2.12.8 and calculator depend on scala version 2.13.8

API is using one of the class in Calculator. This is my build.sbt

name := "sbt-getting-started"

ThisBuild / version := "1.0"

ThisBuild / scalaVersion := "2.13.8"

publish/skip := true

lazy val api = project
  .dependsOn(calculators)
  .enablePlugins(JavaAppPackaging)
  .settings(
    libraryDependencies ++= Dependencies.apiDependencies
  )
  .settings(scalaVersion := "2.12.8")

lazy val calculators = project
  .enablePlugins(JavaAppPackaging)
  .enablePlugins(DockerPlugin)
  .settings(
    scalaVersion := "2.13.8",
    libraryDependencies ++= Dependencies.calculatorDependencies,
 )

As Compiled, I am getting the below error. Help me to resolve the issue.

←[0m[←[0m←[0minfo←[0m] ←[0m←[0mExecuting in batch mode. For better performance use sbt's shell←[0m
←[0m[←[0m←[0minfo←[0m] ←[0m←[0mUpdating api...←[0m
←[0m[←[0m←[31merror←[0m] ←[0m←[0mSERVER ERROR: Bad Gateway **url=https://dl.bintray.com/bala/maven/calculators/calculators_2.12/1.0/calculators_2.12-1.0.pom←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m        module not found: calculators#calculators_2.12;1.0←[0m**
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m==== local: tried←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m  C:\Users\Balachandar.S\.ivy2\local\calculators\calculators_2.12\1.0\ivys\ivy.xml←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m==== public: tried←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m  https://repo1.maven.org/maven2/calculators/calculators_2.12/1.0/calculators_2.12-1.0.pom←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m==== bintray-bala-maven: tried←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m  **https://dl.bintray.com/bala/maven/calculators/calculators_2.12/1.0/calculators_2.12-1.0.pom←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m        ::::::::::::::::::::::::::::::::::::::::::::::←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m        ::          UNRESOLVED DEPENDENCIES         ::←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m        ::::::::::::::::::::::::::::::::::::::::::::::←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m        :: calculators#calculators_2.12;1.0: not found←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m        ::::::::::::::::::::::::::::::::::::::::::::::←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m        Note: Unresolved dependencies path:←[0m**
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m                calculators:calculators_2.12:1.0←[0m
←[0m[←[0m←[33mwarn←[0m] ←[0m←[0m                  +- api:api_2.12:1.0←[0m
←[0m[←[0m←[31merror←[0m] ←[0m←[0msbt.librarymanagement.ResolveException: unresolved dependency: calculators#calculators_2.12;1.0: not found←[0m
←[0m[←[0m←[31merror←[0m] ←[0m←[0m       at sbt.internal.librarymanagement.IvyActions$.resolveAndRetrieve(IvyActions.scala:332)←[0m